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This module adds the support parent-child queries and aggregations

There is a newer version: 7.17.26

/*
 * 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.join;

import org.elasticsearch.index.mapper.Mapper;
import org.elasticsearch.join.aggregations.ChildrenAggregationBuilder;
import org.elasticsearch.join.aggregations.InternalChildren;
import org.elasticsearch.join.aggregations.InternalParent;
import org.elasticsearch.join.aggregations.ParentAggregationBuilder;
import org.elasticsearch.join.mapper.ParentJoinFieldMapper;
import org.elasticsearch.join.query.HasChildQueryBuilder;
import org.elasticsearch.join.query.HasParentQueryBuilder;
import org.elasticsearch.join.query.ParentIdQueryBuilder;
import org.elasticsearch.plugins.MapperPlugin;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.plugins.SearchPlugin;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;

public class ParentJoinPlugin extends Plugin implements SearchPlugin, MapperPlugin {

    public ParentJoinPlugin() {}

    @Override
    public List> getQueries() {
        return Arrays.asList(
            new QuerySpec<>(HasChildQueryBuilder.NAME, HasChildQueryBuilder::new, HasChildQueryBuilder::fromXContent),
            new QuerySpec<>(HasParentQueryBuilder.NAME, HasParentQueryBuilder::new, HasParentQueryBuilder::fromXContent),
            new QuerySpec<>(ParentIdQueryBuilder.NAME, ParentIdQueryBuilder::new, ParentIdQueryBuilder::fromXContent)
        );
    }

    @Override
    public List getAggregations() {
        return Arrays.asList(
            new AggregationSpec(ChildrenAggregationBuilder.NAME, ChildrenAggregationBuilder::new, ChildrenAggregationBuilder::parse)
                .addResultReader(InternalChildren::new),
            new AggregationSpec(ParentAggregationBuilder.NAME, ParentAggregationBuilder::new, ParentAggregationBuilder::parse)
                .addResultReader(InternalParent::new)
        );
    }

    @Override
    public Map getMappers() {
        return Collections.singletonMap(ParentJoinFieldMapper.CONTENT_TYPE, ParentJoinFieldMapper.PARSER);
    }
}