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There is a newer version: 8.17.0
/*
 * 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.deprecate(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));
    }
}