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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.index.query;
import org.apache.logging.log4j.LogManager;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.Fields;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.RoutingMissingException;
import org.elasticsearch.action.termvectors.MultiTermVectorsItemResponse;
import org.elasticsearch.action.termvectors.MultiTermVectorsRequest;
import org.elasticsearch.action.termvectors.MultiTermVectorsResponse;
import org.elasticsearch.action.termvectors.TermVectorsRequest;
import org.elasticsearch.action.termvectors.TermVectorsResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.common.lucene.search.MoreLikeThisQuery;
import org.elasticsearch.common.lucene.search.XMoreLikeThis;
import org.elasticsearch.common.lucene.uid.Versions;
import org.elasticsearch.common.xcontent.ToXContentObject;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.VersionType;
import org.elasticsearch.index.mapper.IdFieldMapper;
import org.elasticsearch.index.mapper.KeywordFieldMapper.KeywordFieldType;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.TextFieldMapper.TextFieldType;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
/**
* A more like this query that finds documents that are "like" the provided set of document(s).
*
* The documents are provided as a set of strings and/or a list of {@link Item}.
*/
public class MoreLikeThisQueryBuilder extends AbstractQueryBuilder {
public static final String NAME = "more_like_this";
private static final DeprecationLogger deprecationLogger = new DeprecationLogger(
LogManager.getLogger(MoreLikeThisQueryBuilder.class));
static final String TYPES_DEPRECATION_MESSAGE = "[types removal] Types are deprecated in [more_like_this] " +
"queries. The type should no longer be specified in the [like] and [unlike] sections.";
public static final int DEFAULT_MAX_QUERY_TERMS = XMoreLikeThis.DEFAULT_MAX_QUERY_TERMS;
public static final int DEFAULT_MIN_TERM_FREQ = XMoreLikeThis.DEFAULT_MIN_TERM_FREQ;
public static final int DEFAULT_MIN_DOC_FREQ = XMoreLikeThis.DEFAULT_MIN_DOC_FREQ;
public static final int DEFAULT_MAX_DOC_FREQ = XMoreLikeThis.DEFAULT_MAX_DOC_FREQ;
public static final int DEFAULT_MIN_WORD_LENGTH = XMoreLikeThis.DEFAULT_MIN_WORD_LENGTH;
public static final int DEFAULT_MAX_WORD_LENGTH = XMoreLikeThis.DEFAULT_MAX_WORD_LENGTH;
public static final String DEFAULT_MINIMUM_SHOULD_MATCH = MoreLikeThisQuery.DEFAULT_MINIMUM_SHOULD_MATCH;
public static final float DEFAULT_BOOST_TERMS = 0; // no boost terms
public static final boolean DEFAULT_INCLUDE = false;
public static final boolean DEFAULT_FAIL_ON_UNSUPPORTED_FIELDS = true;
private static final Set> SUPPORTED_FIELD_TYPES = new HashSet<>(
Arrays.asList(TextFieldType.class, KeywordFieldType.class));
private static final ParseField FIELDS = new ParseField("fields");
private static final ParseField LIKE = new ParseField("like");
private static final ParseField UNLIKE = new ParseField("unlike");
private static final ParseField MAX_QUERY_TERMS = new ParseField("max_query_terms");
private static final ParseField MIN_TERM_FREQ = new ParseField("min_term_freq");
private static final ParseField MIN_DOC_FREQ = new ParseField("min_doc_freq");
private static final ParseField MAX_DOC_FREQ = new ParseField("max_doc_freq");
private static final ParseField MIN_WORD_LENGTH = new ParseField("min_word_length");
private static final ParseField MAX_WORD_LENGTH = new ParseField("max_word_length");
private static final ParseField STOP_WORDS = new ParseField("stop_words");
private static final ParseField ANALYZER = new ParseField("analyzer");
private static final ParseField MINIMUM_SHOULD_MATCH = new ParseField("minimum_should_match");
private static final ParseField BOOST_TERMS = new ParseField("boost_terms");
private static final ParseField INCLUDE = new ParseField("include");
private static final ParseField FAIL_ON_UNSUPPORTED_FIELD = new ParseField("fail_on_unsupported_field");
private static final ParseField INDEX = new ParseField("_index");
private static final ParseField TYPE = new ParseField("_type");
private static final ParseField ID = new ParseField("_id");
public static final ParseField DOC = new ParseField("doc");
private static final ParseField PER_FIELD_ANALYZER = new ParseField("per_field_analyzer");
private static final ParseField ROUTING = new ParseField("routing");
private static final ParseField VERSION = new ParseField("version");
private static final ParseField VERSION_TYPE = new ParseField("version_type");
// document inputs
private final String[] fields;
private final String[] likeTexts;
private String[] unlikeTexts = Strings.EMPTY_ARRAY;
private final Item[] likeItems;
private Item[] unlikeItems = new Item[0];
// term selection parameters
private int maxQueryTerms = DEFAULT_MAX_QUERY_TERMS;
private int minTermFreq = DEFAULT_MIN_TERM_FREQ;
private int minDocFreq = DEFAULT_MIN_DOC_FREQ;
private int maxDocFreq = DEFAULT_MAX_DOC_FREQ;
private int minWordLength = DEFAULT_MIN_WORD_LENGTH;
private int maxWordLength = DEFAULT_MAX_WORD_LENGTH;
private String[] stopWords;
private String analyzer;
// query formation parameters
private String minimumShouldMatch = DEFAULT_MINIMUM_SHOULD_MATCH;
private float boostTerms = DEFAULT_BOOST_TERMS;
private boolean include = DEFAULT_INCLUDE;
// other parameters
private boolean failOnUnsupportedField = DEFAULT_FAIL_ON_UNSUPPORTED_FIELDS;
/**
* A single item to be used for a {@link MoreLikeThisQueryBuilder}.
*/
public static final class Item implements ToXContentObject, Writeable {
public static final Item[] EMPTY_ARRAY = new Item[0];
private String index;
private String type;
private String id;
private BytesReference doc;
private XContentType xContentType;
private String[] fields;
private Map perFieldAnalyzer;
private String routing;
private long version = Versions.MATCH_ANY;
private VersionType versionType = VersionType.INTERNAL;
public Item() {
}
Item(Item copy) {
if (copy.id == null && copy.doc == null) {
throw new IllegalArgumentException("Item requires either id or doc to be non-null");
}
this.index = copy.index;
this.type = copy.type;
this.id = copy.id;
this.routing = copy.routing;
this.doc = copy.doc;
this.xContentType = copy.xContentType;
this.fields = copy.fields;
this.perFieldAnalyzer = copy.perFieldAnalyzer;
this.version = copy.version;
this.versionType = copy.versionType;
}
/**
* Constructor for a given item / document request
*
* @param index the index where the document is located
* @param id and its id
*/
public Item(@Nullable String index, String id) {
if (id == null) {
throw new IllegalArgumentException("Item requires id to be non-null");
}
this.index = index;
this.id = id;
}
/**
* Constructor for an artificial document request, that is not present in the index.
*
* @param index the index to be used for parsing the doc
* @param doc the document specification
*/
public Item(@Nullable String index, XContentBuilder doc) {
if (doc == null) {
throw new IllegalArgumentException("Item requires doc to be non-null");
}
this.index = index;
this.doc = BytesReference.bytes(doc);
this.xContentType = doc.contentType();
}
/**
* Constructor for a given item / document request
*
* @param index the index where the document is located
* @param type the type of the document
* @param id and its id
*
* @deprecated Types are in the process of being removed, use {@link Item(String, String)} instead.
*/
@Deprecated
public Item(@Nullable String index, @Nullable String type, String id) {
if (id == null) {
throw new IllegalArgumentException("Item requires id to be non-null");
}
this.index = index;
this.type = type;
this.id = id;
}
/**
* Constructor for an artificial document request, that is not present in the index.
*
* @param index the index to be used for parsing the doc
* @param type the type to be used for parsing the doc
* @param doc the document specification
*
* @deprecated Types are in the process of being removed, use {@link Item(String, XContentBuilder)} instead.
*/
@Deprecated
public Item(@Nullable String index, @Nullable String type, XContentBuilder doc) {
if (doc == null) {
throw new IllegalArgumentException("Item requires doc to be non-null");
}
this.index = index;
this.type = type;
this.doc = BytesReference.bytes(doc);
this.xContentType = doc.contentType();
}
/**
* Read from a stream.
*/
Item(StreamInput in) throws IOException {
index = in.readOptionalString();
type = in.readOptionalString();
if (in.readBoolean()) {
doc = (BytesReference) in.readGenericValue();
xContentType = in.readEnum(XContentType.class);
} else {
id = in.readString();
}
fields = in.readOptionalStringArray();
perFieldAnalyzer = (Map) in.readGenericValue();
routing = in.readOptionalString();
version = in.readLong();
versionType = VersionType.readFromStream(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeOptionalString(index);
out.writeOptionalString(type);
out.writeBoolean(doc != null);
if (doc != null) {
out.writeGenericValue(doc);
out.writeEnum(xContentType);
} else {
out.writeString(id);
}
out.writeOptionalStringArray(fields);
out.writeGenericValue(perFieldAnalyzer);
out.writeOptionalString(routing);
out.writeLong(version);
versionType.writeTo(out);
}
public String index() {
return index;
}
public Item index(String index) {
this.index = index;
return this;
}
/**
* @deprecated Types are in the process of being removed.
*/
@Deprecated
public String type() {
return type;
}
/**
* @deprecated Types are in the process of being removed.
*/
@Deprecated
public Item type(String type) {
this.type = type;
return this;
}
public String id() {
return id;
}
public BytesReference doc() {
return doc;
}
public String[] fields() {
return fields;
}
public Item fields(String... fields) {
this.fields = fields;
return this;
}
public Map perFieldAnalyzer() {
return perFieldAnalyzer;
}
/**
* Sets the analyzer(s) to use at any given field.
*/
public Item perFieldAnalyzer(Map perFieldAnalyzer) {
this.perFieldAnalyzer = perFieldAnalyzer;
return this;
}
public String routing() {
return routing;
}
public Item routing(String routing) {
this.routing = routing;
return this;
}
public long version() {
return version;
}
public Item version(long version) {
this.version = version;
return this;
}
public VersionType versionType() {
return versionType;
}
public Item versionType(VersionType versionType) {
this.versionType = versionType;
return this;
}
XContentType xContentType() {
return xContentType;
}
/**
* Convert this to a {@link TermVectorsRequest} for fetching the terms of the document.
*/
TermVectorsRequest toTermVectorsRequest() {
TermVectorsRequest termVectorsRequest = new TermVectorsRequest(index, type, id)
.selectedFields(fields)
.routing(routing)
.version(version)
.versionType(versionType)
.perFieldAnalyzer(perFieldAnalyzer)
.positions(false) // ensures these following parameters are never set
.offsets(false)
.payloads(false)
.fieldStatistics(false)
.termStatistics(false);
// for artificial docs to make sure that the id has changed in the item too
if (doc != null) {
termVectorsRequest.doc(doc, true, xContentType);
this.id = termVectorsRequest.id();
}
return termVectorsRequest;
}
/**
* Parses and returns the given item.
*/
public static Item parse(XContentParser parser, Item item) throws IOException {
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (currentFieldName != null) {
if (INDEX.match(currentFieldName, parser.getDeprecationHandler())) {
item.index = parser.text();
} else if (TYPE.match(currentFieldName, parser.getDeprecationHandler())) {
item.type = parser.text();
} else if (ID.match(currentFieldName, parser.getDeprecationHandler())) {
item.id = parser.text();
} else if (DOC.match(currentFieldName, parser.getDeprecationHandler())) {
item.doc = BytesReference.bytes(jsonBuilder().copyCurrentStructure(parser));
item.xContentType = XContentType.JSON;
} else if (FIELDS.match(currentFieldName, parser.getDeprecationHandler())) {
if (token == XContentParser.Token.START_ARRAY) {
List fields = new ArrayList<>();
while (parser.nextToken() != XContentParser.Token.END_ARRAY) {
fields.add(parser.text());
}
item.fields(fields.toArray(new String[fields.size()]));
} else {
throw new ElasticsearchParseException(
"failed to parse More Like This item. field [fields] must be an array");
}
} else if (PER_FIELD_ANALYZER.match(currentFieldName, parser.getDeprecationHandler())) {
item.perFieldAnalyzer(TermVectorsRequest.readPerFieldAnalyzer(parser.map()));
} else if (ROUTING.match(currentFieldName, parser.getDeprecationHandler())) {
item.routing = parser.text();
} else if (VERSION.match(currentFieldName, parser.getDeprecationHandler())) {
item.version = parser.longValue();
} else if (VERSION_TYPE.match(currentFieldName, parser.getDeprecationHandler())) {
item.versionType = VersionType.fromString(parser.text());
} else {
throw new ElasticsearchParseException(
"failed to parse More Like This item. unknown field [{}]", currentFieldName);
}
}
}
if (item.id != null && item.doc != null) {
throw new ElasticsearchParseException(
"failed to parse More Like This item. either [id] or [doc] can be specified, but not both!");
}
if (item.id == null && item.doc == null) {
throw new ElasticsearchParseException(
"failed to parse More Like This item. neither [id] nor [doc] is specified!");
}
return item;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
if (this.index != null) {
builder.field(INDEX.getPreferredName(), this.index);
}
if (this.type != null) {
builder.field(TYPE.getPreferredName(), this.type);
}
if (this.id != null) {
builder.field(ID.getPreferredName(), this.id);
}
if (this.doc != null) {
try (InputStream stream = this.doc.streamInput()) {
builder.rawField(DOC.getPreferredName(), stream, xContentType);
}
}
if (this.fields != null) {
builder.array(FIELDS.getPreferredName(), this.fields);
}
if (this.perFieldAnalyzer != null) {
builder.field(PER_FIELD_ANALYZER.getPreferredName(), this.perFieldAnalyzer);
}
if (this.routing != null) {
builder.field(ROUTING.getPreferredName(), this.routing);
}
if (this.version != Versions.MATCH_ANY) {
builder.field(VERSION.getPreferredName(), this.version);
}
if (this.versionType != VersionType.INTERNAL) {
builder.field(VERSION_TYPE.getPreferredName(), this.versionType.toString().toLowerCase(Locale.ROOT));
}
return builder.endObject();
}
@Override
public String toString() {
try {
XContentBuilder builder = XContentFactory.jsonBuilder();
builder.prettyPrint();
toXContent(builder, EMPTY_PARAMS);
return Strings.toString(builder);
} catch (Exception e) {
return "{ \"error\" : \"" + ExceptionsHelper.detailedMessage(e) + "\"}";
}
}
@Override
public int hashCode() {
return Objects.hash(index, type, id, doc, Arrays.hashCode(fields), perFieldAnalyzer, routing,
version, versionType);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Item)) return false;
Item other = (Item) o;
return Objects.equals(index, other.index)
&& Objects.equals(type, other.type)
&& Objects.equals(id, other.id)
&& Objects.equals(doc, other.doc)
&& Arrays.equals(fields, other.fields) // otherwise we are comparing pointers
&& Objects.equals(perFieldAnalyzer, other.perFieldAnalyzer)
&& Objects.equals(routing, other.routing)
&& Objects.equals(version, other.version)
&& Objects.equals(versionType, other.versionType);
}
}
/**
* Constructs a new more like this query which uses the default search field.
* @param likeTexts the text to use when generating the 'More Like This' query.
* @param likeItems the documents to use when generating the 'More Like This' query.
*/
public MoreLikeThisQueryBuilder(String[] likeTexts, Item[] likeItems) {
this(null, likeTexts, likeItems);
}
/**
* Sets the field names that will be used when generating the 'More Like This' query.
*
* @param fields the field names that will be used when generating the 'More Like This' query.
* @param likeTexts the text to use when generating the 'More Like This' query.
* @param likeItems the documents to use when generating the 'More Like This' query.
*/
public MoreLikeThisQueryBuilder(@Nullable String[] fields, @Nullable String[] likeTexts, @Nullable Item[] likeItems) {
// TODO we allow null here for the _all field, but this is forbidden in the parser. Re-check
if (fields != null && fields.length == 0) {
throw new IllegalArgumentException(NAME + " query requires 'fields' to be specified");
}
if ((likeTexts == null || likeTexts.length == 0) && (likeItems == null || likeItems.length == 0)) {
throw new IllegalArgumentException(NAME + " query requires either 'like' texts or items to be specified.");
}
this.fields = fields;
this.likeTexts = Optional.ofNullable(likeTexts).orElse(Strings.EMPTY_ARRAY);
this.likeItems = Optional.ofNullable(likeItems).orElse(new Item[0]);
}
/**
* Read from a stream.
*/
public MoreLikeThisQueryBuilder(StreamInput in) throws IOException {
super(in);
fields = in.readOptionalStringArray();
likeTexts = in.readStringArray();
likeItems = in.readList(Item::new).toArray(new Item[0]);
unlikeTexts = in.readStringArray();
unlikeItems = in.readList(Item::new).toArray(new Item[0]);
maxQueryTerms = in.readVInt();
minTermFreq = in.readVInt();
minDocFreq = in.readVInt();
maxDocFreq = in.readVInt();
minWordLength = in.readVInt();
maxWordLength = in.readVInt();
stopWords = in.readOptionalStringArray();
analyzer = in.readOptionalString();
minimumShouldMatch = in.readString();
boostTerms = (Float) in.readGenericValue();
include = in.readBoolean();
failOnUnsupportedField = in.readBoolean();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeOptionalStringArray(fields);
out.writeStringArray(likeTexts);
out.writeList(Arrays.asList(likeItems));
out.writeStringArray(unlikeTexts);
out.writeList(Arrays.asList(unlikeItems));
out.writeVInt(maxQueryTerms);
out.writeVInt(minTermFreq);
out.writeVInt(minDocFreq);
out.writeVInt(maxDocFreq);
out.writeVInt(minWordLength);
out.writeVInt(maxWordLength);
out.writeOptionalStringArray(stopWords);
out.writeOptionalString(analyzer);
out.writeString(minimumShouldMatch);
out.writeGenericValue(boostTerms);
out.writeBoolean(include);
out.writeBoolean(failOnUnsupportedField);
}
public String[] fields() {
return this.fields;
}
public String[] likeTexts() {
return likeTexts;
}
public Item[] likeItems() {
return likeItems;
}
/**
* Sets the text from which the terms should not be selected from.
*/
public MoreLikeThisQueryBuilder unlike(String[] unlikeTexts) {
this.unlikeTexts = Optional.ofNullable(unlikeTexts).orElse(Strings.EMPTY_ARRAY);
return this;
}
public String[] unlikeTexts() {
return unlikeTexts;
}
/**
* Sets the documents from which the terms should not be selected from.
*/
public MoreLikeThisQueryBuilder unlike(Item[] unlikeItems) {
this.unlikeItems = Optional.ofNullable(unlikeItems).orElse(new Item[0]);
return this;
}
public Item[] unlikeItems() {
return unlikeItems;
}
/**
* Sets the maximum number of query terms that will be included in any generated query.
* Defaults to {@code 25}.
*/
public MoreLikeThisQueryBuilder maxQueryTerms(int maxQueryTerms) {
if (maxQueryTerms <= 0) {
throw new IllegalArgumentException("requires 'maxQueryTerms' to be greater than 0");
}
this.maxQueryTerms = maxQueryTerms;
return this;
}
public int maxQueryTerms() {
return maxQueryTerms;
}
/**
* The frequency below which terms will be ignored in the source doc. The default
* frequency is {@code 2}.
*/
public MoreLikeThisQueryBuilder minTermFreq(int minTermFreq) {
this.minTermFreq = minTermFreq;
return this;
}
public int minTermFreq() {
return minTermFreq;
}
/**
* Sets the frequency at which words will be ignored which do not occur in at least this
* many docs. Defaults to {@code 5}.
*/
public MoreLikeThisQueryBuilder minDocFreq(int minDocFreq) {
this.minDocFreq = minDocFreq;
return this;
}
public int minDocFreq() {
return minDocFreq;
}
/**
* Set the maximum frequency in which words may still appear. Words that appear
* in more than this many docs will be ignored. Defaults to unbounded.
*/
public MoreLikeThisQueryBuilder maxDocFreq(int maxDocFreq) {
this.maxDocFreq = maxDocFreq;
return this;
}
public int maxDocFreq() {
return maxDocFreq;
}
/**
* Sets the minimum word length below which words will be ignored. Defaults
* to {@code 0}.
*/
public MoreLikeThisQueryBuilder minWordLength(int minWordLength) {
this.minWordLength = minWordLength;
return this;
}
public int minWordLength() {
return minWordLength;
}
/**
* Sets the maximum word length above which words will be ignored. Defaults to
* unbounded ({@code 0}).
*/
public MoreLikeThisQueryBuilder maxWordLength(int maxWordLength) {
this.maxWordLength = maxWordLength;
return this;
}
public int maxWordLength() {
return maxWordLength;
}
/**
* Set the set of stopwords.
*
* Any word in this set is considered "uninteresting" and ignored. Even if your Analyzer allows stopwords, you
* might want to tell the MoreLikeThis code to ignore them, as for the purposes of document similarity it seems
* reasonable to assume that "a stop word is never interesting".
*/
public MoreLikeThisQueryBuilder stopWords(String... stopWords) {
this.stopWords = stopWords;
return this;
}
public MoreLikeThisQueryBuilder stopWords(List stopWords) {
if (stopWords == null) {
throw new IllegalArgumentException("requires stopwords to be non-null");
}
this.stopWords = stopWords.toArray(new String[stopWords.size()]);
return this;
}
public String[] stopWords() {
return stopWords;
}
/**
* The analyzer that will be used to analyze the text. Defaults to the analyzer associated with the field.
*/
public MoreLikeThisQueryBuilder analyzer(String analyzer) {
this.analyzer = analyzer;
return this;
}
public String analyzer() {
return analyzer;
}
/**
* Number of terms that must match the generated query expressed in the
* common syntax for minimum should match. Defaults to {@code 30%}.
*
* @see org.elasticsearch.common.lucene.search.Queries#calculateMinShouldMatch(int, String)
*/
public MoreLikeThisQueryBuilder minimumShouldMatch(String minimumShouldMatch) {
if (minimumShouldMatch == null) {
throw new IllegalArgumentException("[" + NAME + "] requires minimum should match to be non-null");
}
this.minimumShouldMatch = minimumShouldMatch;
return this;
}
public String minimumShouldMatch() {
return minimumShouldMatch;
}
/**
* Sets the boost factor to use when boosting terms. Defaults to {@code 0} (deactivated).
*/
public MoreLikeThisQueryBuilder boostTerms(float boostTerms) {
this.boostTerms = boostTerms;
return this;
}
public float boostTerms() {
return boostTerms;
}
/**
* Whether to include the input documents. Defaults to {@code false}
*/
public MoreLikeThisQueryBuilder include(boolean include) {
this.include = include;
return this;
}
public boolean include() {
return include;
}
/**
* Whether to fail or return no result when this query is run against a field which is not supported such as binary/numeric fields.
*/
public MoreLikeThisQueryBuilder failOnUnsupportedField(boolean fail) {
this.failOnUnsupportedField = fail;
return this;
}
public boolean failOnUnsupportedField() {
return failOnUnsupportedField;
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
if (fields != null) {
builder.array(FIELDS.getPreferredName(), fields);
}
buildLikeField(builder, LIKE.getPreferredName(), likeTexts, likeItems);
buildLikeField(builder, UNLIKE.getPreferredName(), unlikeTexts, unlikeItems);
builder.field(MAX_QUERY_TERMS.getPreferredName(), maxQueryTerms);
builder.field(MIN_TERM_FREQ.getPreferredName(), minTermFreq);
builder.field(MIN_DOC_FREQ.getPreferredName(), minDocFreq);
builder.field(MAX_DOC_FREQ.getPreferredName(), maxDocFreq);
builder.field(MIN_WORD_LENGTH.getPreferredName(), minWordLength);
builder.field(MAX_WORD_LENGTH.getPreferredName(), maxWordLength);
if (stopWords != null) {
builder.array(STOP_WORDS.getPreferredName(), stopWords);
}
if (analyzer != null) {
builder.field(ANALYZER.getPreferredName(), analyzer);
}
builder.field(MINIMUM_SHOULD_MATCH.getPreferredName(), minimumShouldMatch);
builder.field(BOOST_TERMS.getPreferredName(), boostTerms);
builder.field(INCLUDE.getPreferredName(), include);
builder.field(FAIL_ON_UNSUPPORTED_FIELD.getPreferredName(), failOnUnsupportedField);
printBoostAndQueryName(builder);
builder.endObject();
}
public static MoreLikeThisQueryBuilder fromXContent(XContentParser parser) throws IOException {
// document inputs
List fields = null;
List likeTexts = new ArrayList<>();
List unlikeTexts = new ArrayList<>();
List- likeItems = new ArrayList<>();
List
- unlikeItems = new ArrayList<>();
// term selection parameters
int maxQueryTerms = MoreLikeThisQueryBuilder.DEFAULT_MAX_QUERY_TERMS;
int minTermFreq = MoreLikeThisQueryBuilder.DEFAULT_MIN_TERM_FREQ;
int minDocFreq = MoreLikeThisQueryBuilder.DEFAULT_MIN_DOC_FREQ;
int maxDocFreq = MoreLikeThisQueryBuilder.DEFAULT_MAX_DOC_FREQ;
int minWordLength = MoreLikeThisQueryBuilder.DEFAULT_MIN_WORD_LENGTH;
int maxWordLength = MoreLikeThisQueryBuilder.DEFAULT_MAX_WORD_LENGTH;
List
stopWords = null;
String analyzer = null;
// query formation parameters
String minimumShouldMatch = MoreLikeThisQueryBuilder.DEFAULT_MINIMUM_SHOULD_MATCH;
float boostTerms = MoreLikeThisQueryBuilder.DEFAULT_BOOST_TERMS;
boolean include = MoreLikeThisQueryBuilder.DEFAULT_INCLUDE;
// other parameters
boolean failOnUnsupportedField = MoreLikeThisQueryBuilder.DEFAULT_FAIL_ON_UNSUPPORTED_FIELDS;
float boost = AbstractQueryBuilder.DEFAULT_BOOST;
String queryName = null;
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if (LIKE.match(currentFieldName, parser.getDeprecationHandler())) {
parseLikeField(parser, likeTexts, likeItems);
} else if (UNLIKE.match(currentFieldName, parser.getDeprecationHandler())) {
parseLikeField(parser, unlikeTexts, unlikeItems);
} else if (MAX_QUERY_TERMS.match(currentFieldName, parser.getDeprecationHandler())) {
maxQueryTerms = parser.intValue();
} else if (MIN_TERM_FREQ.match(currentFieldName, parser.getDeprecationHandler())) {
minTermFreq =parser.intValue();
} else if (MIN_DOC_FREQ.match(currentFieldName, parser.getDeprecationHandler())) {
minDocFreq = parser.intValue();
} else if (MAX_DOC_FREQ.match(currentFieldName, parser.getDeprecationHandler())) {
maxDocFreq = parser.intValue();
} else if (MIN_WORD_LENGTH.match(currentFieldName, parser.getDeprecationHandler())) {
minWordLength = parser.intValue();
} else if (MAX_WORD_LENGTH.match(currentFieldName, parser.getDeprecationHandler())) {
maxWordLength = parser.intValue();
} else if (ANALYZER.match(currentFieldName, parser.getDeprecationHandler())) {
analyzer = parser.text();
} else if (MINIMUM_SHOULD_MATCH.match(currentFieldName, parser.getDeprecationHandler())) {
minimumShouldMatch = parser.text();
} else if (BOOST_TERMS.match(currentFieldName, parser.getDeprecationHandler())) {
boostTerms = parser.floatValue();
} else if (INCLUDE.match(currentFieldName, parser.getDeprecationHandler())) {
include = parser.booleanValue();
} else if (FAIL_ON_UNSUPPORTED_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
failOnUnsupportedField = parser.booleanValue();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new ParsingException(parser.getTokenLocation(), "[mlt] query does not support [" + currentFieldName + "]");
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (FIELDS.match(currentFieldName, parser.getDeprecationHandler())) {
fields = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
fields.add(parser.text());
}
} else if (LIKE.match(currentFieldName, parser.getDeprecationHandler())) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
parseLikeField(parser, likeTexts, likeItems);
}
} else if (UNLIKE.match(currentFieldName, parser.getDeprecationHandler())) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
parseLikeField(parser, unlikeTexts, unlikeItems);
}
} else if (STOP_WORDS.match(currentFieldName, parser.getDeprecationHandler())) {
stopWords = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
stopWords.add(parser.text());
}
} else {
throw new ParsingException(parser.getTokenLocation(), "[mlt] query does not support [" + currentFieldName + "]");
}
} else if (token == XContentParser.Token.START_OBJECT) {
if (LIKE.match(currentFieldName, parser.getDeprecationHandler())) {
parseLikeField(parser, likeTexts, likeItems);
} else if (UNLIKE.match(currentFieldName, parser.getDeprecationHandler())) {
parseLikeField(parser, unlikeTexts, unlikeItems);
} else {
throw new ParsingException(parser.getTokenLocation(), "[mlt] query does not support [" + currentFieldName + "]");
}
}
}
if (likeTexts.isEmpty() && likeItems.isEmpty()) {
throw new ParsingException(parser.getTokenLocation(), "more_like_this requires 'like' to be specified");
}
if (fields != null && fields.isEmpty()) {
throw new ParsingException(parser.getTokenLocation(), "more_like_this requires 'fields' to be non-empty");
}
String[] fieldsArray = fields == null ? null : fields.toArray(new String[fields.size()]);
String[] likeTextsArray = likeTexts.isEmpty() ? null : likeTexts.toArray(new String[likeTexts.size()]);
String[] unlikeTextsArray = unlikeTexts.isEmpty() ? null : unlikeTexts.toArray(new String[unlikeTexts.size()]);
Item[] likeItemsArray = likeItems.isEmpty() ? null : likeItems.toArray(new Item[likeItems.size()]);
Item[] unlikeItemsArray = unlikeItems.isEmpty() ? null : unlikeItems.toArray(new Item[unlikeItems.size()]);
MoreLikeThisQueryBuilder moreLikeThisQueryBuilder = new MoreLikeThisQueryBuilder(fieldsArray, likeTextsArray, likeItemsArray)
.unlike(unlikeTextsArray)
.unlike(unlikeItemsArray)
.maxQueryTerms(maxQueryTerms)
.minTermFreq(minTermFreq)
.minDocFreq(minDocFreq)
.maxDocFreq(maxDocFreq)
.minWordLength(minWordLength)
.maxWordLength(maxWordLength)
.analyzer(analyzer)
.minimumShouldMatch(minimumShouldMatch)
.boostTerms(boostTerms)
.include(include)
.failOnUnsupportedField(failOnUnsupportedField)
.boost(boost)
.queryName(queryName);
if (stopWords != null) {
moreLikeThisQueryBuilder.stopWords(stopWords);
}
if (moreLikeThisQueryBuilder.isTypeless() == false) {
deprecationLogger.deprecatedAndMaybeLog("more_like_this_query_with_types", TYPES_DEPRECATION_MESSAGE);
}
return moreLikeThisQueryBuilder;
}
public boolean isTypeless() {
return Stream.concat(Arrays.stream(likeItems), Arrays.stream(unlikeItems))
.allMatch(item -> item.type == null);
}
private static void parseLikeField(XContentParser parser, List texts, List- items) throws IOException {
if (parser.currentToken().isValue()) {
texts.add(parser.text());
} else if (parser.currentToken() == XContentParser.Token.START_OBJECT) {
items.add(Item.parse(parser, new Item()));
} else {
throw new IllegalArgumentException("Content of 'like' parameter should either be a string or an object");
}
}
private static void buildLikeField(XContentBuilder builder, String fieldName, String[] texts, Item[] items) throws IOException {
if (texts.length > 0 || items.length > 0) {
builder.startArray(fieldName);
for (String text : texts) {
builder.value(text);
}
for (Item item : items) {
builder.value(item);
}
builder.endArray();
}
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
Item[] likeItems = new Item[this.likeItems.length];
for (int i = 0; i < likeItems.length; i++) {
likeItems[i] = new Item(this.likeItems[i]);
}
Item[] unlikeItems = new Item[this.unlikeItems.length];
for (int i = 0; i < unlikeItems.length; i++) {
unlikeItems[i] = new Item(this.unlikeItems[i]);
}
MoreLikeThisQuery mltQuery = new MoreLikeThisQuery();
// set similarity
mltQuery.setSimilarity(context.getSearchSimilarity());
// set query parameters
mltQuery.setMaxQueryTerms(maxQueryTerms);
mltQuery.setMinTermFrequency(minTermFreq);
mltQuery.setMinDocFreq(minDocFreq);
mltQuery.setMaxDocFreq(maxDocFreq);
mltQuery.setMinWordLen(minWordLength);
mltQuery.setMaxWordLen(maxWordLength);
mltQuery.setMinimumShouldMatch(minimumShouldMatch);
if (stopWords != null) {
mltQuery.setStopWords(new HashSet<>(Arrays.asList(stopWords)));
}
// sets boost terms
if (boostTerms != 0) {
mltQuery.setBoostTerms(true);
mltQuery.setBoostTermsFactor(boostTerms);
}
// set analyzer
Analyzer analyzerObj = context.getIndexAnalyzers().get(analyzer);
if (analyzerObj == null) {
analyzerObj = context.getMapperService().searchAnalyzer();
}
mltQuery.setAnalyzer(analyzerObj);
// set like text fields
boolean useDefaultField = (fields == null);
List
moreLikeFields = new ArrayList<>();
if (useDefaultField) {
moreLikeFields = context.defaultFields();
if (moreLikeFields.size() == 1
&& moreLikeFields.get(0).equals("*")
&& (likeTexts.length > 0 || unlikeTexts.length > 0)) {
throw new IllegalArgumentException("[more_like_this] query cannot infer the field to analyze the free text, " +
"you should update the [index.query.default_field] index setting to a field that exists in the mapping or " +
"set the [fields] option in the query.");
}
} else {
for (String field : fields) {
MappedFieldType fieldType = context.fieldMapper(field);
if (fieldType != null && SUPPORTED_FIELD_TYPES.contains(fieldType.getClass()) == false) {
if (failOnUnsupportedField) {
throw new IllegalArgumentException("more_like_this only supports text/keyword fields: [" + field + "]");
} else {
// skip
continue;
}
}
moreLikeFields.add(fieldType == null ? field : fieldType.name());
}
}
if (moreLikeFields.isEmpty()) {
return null;
}
mltQuery.setMoreLikeFields(moreLikeFields.toArray(new String[moreLikeFields.size()]));
// handle like texts
if (likeTexts.length > 0) {
mltQuery.setLikeText(likeTexts);
}
if (unlikeTexts.length > 0) {
mltQuery.setUnlikeText(unlikeTexts);
}
// handle items
if (likeItems.length > 0) {
return handleItems(context, mltQuery, likeItems, unlikeItems, include, moreLikeFields, useDefaultField);
} else {
return mltQuery;
}
}
private Query handleItems(QueryShardContext context, MoreLikeThisQuery mltQuery, Item[] likeItems, Item[] unlikeItems,
boolean include, List moreLikeFields, boolean useDefaultField) throws IOException {
// set default index, type and fields if not specified
for (Item item : likeItems) {
setDefaultIndexTypeFields(context, item, moreLikeFields, useDefaultField);
}
for (Item item : unlikeItems) {
setDefaultIndexTypeFields(context, item, moreLikeFields, useDefaultField);
}
// fetching the items with multi-termvectors API
MultiTermVectorsResponse likeItemsResponse = fetchResponse(context.getClient(), likeItems);
// getting the Fields for liked items
mltQuery.setLikeFields(getFieldsFor(likeItemsResponse));
// getting the Fields for unliked items
if (unlikeItems.length > 0) {
MultiTermVectorsResponse unlikeItemsResponse = fetchResponse(context.getClient(), unlikeItems);
org.apache.lucene.index.Fields[] unlikeFields = getFieldsFor(unlikeItemsResponse);
if (unlikeFields.length > 0) {
mltQuery.setUnlikeFields(unlikeFields);
}
}
BooleanQuery.Builder boolQuery = new BooleanQuery.Builder();
boolQuery.add(mltQuery, BooleanClause.Occur.SHOULD);
// exclude the items from the search
if (!include) {
handleExclude(boolQuery, likeItems, context);
}
return boolQuery.build();
}
private static void setDefaultIndexTypeFields(QueryShardContext context, Item item, List moreLikeFields,
boolean useDefaultField) {
if (item.index() == null) {
item.index(context.index().getName());
}
if (item.type() == null) {
item.type(MapperService.SINGLE_MAPPING_NAME);
}
// default fields if not present but don't override for artificial docs
if ((item.fields() == null || item.fields().length == 0) && item.doc() == null) {
if (useDefaultField) {
item.fields("*");
} else {
item.fields(moreLikeFields.toArray(new String[moreLikeFields.size()]));
}
}
}
private MultiTermVectorsResponse fetchResponse(Client client, Item[] items) throws IOException {
MultiTermVectorsRequest request = new MultiTermVectorsRequest();
for (Item item : items) {
request.add(item.toTermVectorsRequest());
}
return client.multiTermVectors(request).actionGet();
}
private static Fields[] getFieldsFor(MultiTermVectorsResponse responses) throws IOException {
List likeFields = new ArrayList<>();
for (MultiTermVectorsItemResponse response : responses) {
if (response.isFailed()) {
checkRoutingMissingException(response);
continue;
}
TermVectorsResponse getResponse = response.getResponse();
if (!getResponse.isExists()) {
continue;
}
likeFields.add(getResponse.getFields());
}
return likeFields.toArray(Fields.EMPTY_ARRAY);
}
private static void checkRoutingMissingException(MultiTermVectorsItemResponse response) {
Throwable cause = ExceptionsHelper.unwrap(response.getFailure().getCause(), RoutingMissingException.class);
if (cause != null) {
throw ((RoutingMissingException) cause);
}
}
private static void handleExclude(BooleanQuery.Builder boolQuery, Item[] likeItems, QueryShardContext context) {
MappedFieldType idField = context.fieldMapper(IdFieldMapper.NAME);
if (idField == null) {
// no mappings, nothing to exclude
return;
}
// artificial docs get assigned a random id and should be disregarded
List ids = new ArrayList<>();
for (Item item : likeItems) {
if (item.doc() != null) {
continue;
}
ids.add(item.id());
}
if (!ids.isEmpty()) {
Query query = idField.termsQuery(ids, context);
boolQuery.add(query, BooleanClause.Occur.MUST_NOT);
}
}
@Override
protected int doHashCode() {
return Objects.hash(Arrays.hashCode(fields), Arrays.hashCode(likeTexts),
Arrays.hashCode(unlikeTexts), Arrays.hashCode(likeItems), Arrays.hashCode(unlikeItems),
maxQueryTerms, minTermFreq, minDocFreq, maxDocFreq, minWordLength, maxWordLength,
Arrays.hashCode(stopWords), analyzer, minimumShouldMatch, boostTerms, include, failOnUnsupportedField);
}
@Override
protected boolean doEquals(MoreLikeThisQueryBuilder other) {
return Arrays.equals(fields, other.fields)
&& Arrays.equals(likeTexts, other.likeTexts)
&& Arrays.equals(unlikeTexts, other.unlikeTexts)
&& Arrays.equals(likeItems, other.likeItems)
&& Arrays.equals(unlikeItems, other.unlikeItems)
&& Objects.equals(maxQueryTerms, other.maxQueryTerms)
&& Objects.equals(minTermFreq, other.minTermFreq)
&& Objects.equals(minDocFreq, other.minDocFreq)
&& Objects.equals(maxDocFreq, other.maxDocFreq)
&& Objects.equals(minWordLength, other.minWordLength)
&& Objects.equals(maxWordLength, other.maxWordLength)
&& Arrays.equals(stopWords, other.stopWords) // otherwise we are comparing pointers
&& Objects.equals(analyzer, other.analyzer)
&& Objects.equals(minimumShouldMatch, other.minimumShouldMatch)
&& Objects.equals(boostTerms, other.boostTerms)
&& Objects.equals(include, other.include)
&& Objects.equals(failOnUnsupportedField, other.failOnUnsupportedField);
}
@Override
protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) {
// TODO this needs heavy cleanups before we can rewrite it
return this;
}
}