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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.rest.action.search;
import org.elasticsearch.action.explain.ExplainRequest;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.logging.DeprecationCategory;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.RestActions;
import org.elasticsearch.rest.action.RestStatusToXContentListener;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import java.io.IOException;
import java.util.List;
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.POST;
/**
* Rest action for computing a score explanation for specific documents.
*/
public class RestExplainAction extends BaseRestHandler {
private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(RestExplainAction.class);
public static final String TYPES_DEPRECATION_MESSAGE = "[types removal] " + "Specifying a type in explain requests is deprecated.";
@Override
public List routes() {
return unmodifiableList(
asList(
new Route(GET, "/{index}/_explain/{id}"),
new Route(POST, "/{index}/_explain/{id}"),
// Deprecated typed endpoints.
new Route(GET, "/{index}/{type}/{id}/_explain"),
new Route(POST, "/{index}/{type}/{id}/_explain")
)
);
}
@Override
public String getName() {
return "explain_action";
}
@Override
public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
ExplainRequest explainRequest;
if (request.hasParam("type")) {
deprecationLogger.critical(DeprecationCategory.TYPES, "explain_with_types", TYPES_DEPRECATION_MESSAGE);
explainRequest = new ExplainRequest(request.param("index"), request.param("type"), request.param("id"));
} else {
explainRequest = new ExplainRequest(request.param("index"), request.param("id"));
}
explainRequest.parent(request.param("parent"));
explainRequest.routing(request.param("routing"));
explainRequest.preference(request.param("preference"));
String queryString = request.param("q");
request.withContentOrSourceParamParserOrNull(parser -> {
if (parser != null) {
explainRequest.query(RestActions.getQueryContent(parser));
} else if (queryString != null) {
QueryBuilder query = RestActions.urlParamsToQueryBuilder(request);
explainRequest.query(query);
}
});
if (request.param("fields") != null) {
throw new IllegalArgumentException(
"The parameter [fields] is no longer supported, " + "please use [stored_fields] to retrieve stored fields"
);
}
String sField = request.param("stored_fields");
if (sField != null) {
String[] sFields = Strings.splitStringByCommaToArray(sField);
if (sFields != null) {
explainRequest.storedFields(sFields);
}
}
explainRequest.fetchSourceContext(FetchSourceContext.parseFromRestRequest(request));
return channel -> client.explain(explainRequest, new RestStatusToXContentListener<>(channel));
}
}