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There is a newer version: 8.15.1

/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.search.facets.query;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.QueryWrapperFilter;
import org.elasticsearch.common.lucene.docset.DocSet;
import org.elasticsearch.common.lucene.docset.DocSets;
import org.elasticsearch.index.cache.filter.FilterCache;
import org.elasticsearch.search.facets.Facet;
import org.elasticsearch.search.facets.support.AbstractFacetCollector;

import java.io.IOException;

/**
 * @author kimchy (shay.banon)
 */
public class QueryFacetCollector extends AbstractFacetCollector {

    private final Filter filter;

    private DocSet docSet;

    private int count = 0;

    public QueryFacetCollector(String facetName, Query query, FilterCache filterCache) {
        super(facetName);
        this.filter = filterCache.cache(new QueryWrapperFilter(query));
    }

    @Override protected void doSetNextReader(IndexReader reader, int docBase) throws IOException {
        docSet = DocSets.convert(reader, filter.getDocIdSet(reader));
    }

    @Override protected void doCollect(int doc) throws IOException {
        if (docSet.get(doc)) {
            count++;
        }
    }

    @Override public Facet facet() {
        return new InternalQueryFacet(facetName, count);
    }
}