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There is a newer version: 2.18.0

/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.aggregations.pipeline;

import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.search.DocValueFormat;
import org.opensearch.search.aggregations.InternalAggregation;
import org.opensearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;

import java.io.IOException;
import java.util.Map;

/**
 * Aggregate all docs into an average bucket
 *
 * @opensearch.internal
 */
public class AvgBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
    private int count = 0;
    private double sum = 0;

    AvgBucketPipelineAggregator(
        String name,
        String[] bucketsPaths,
        GapPolicy gapPolicy,
        DocValueFormat format,
        Map metadata
    ) {
        super(name, bucketsPaths, gapPolicy, format, metadata);
    }

    /**
     * Read from a stream.
     */
    public AvgBucketPipelineAggregator(StreamInput in) throws IOException {
        super(in);
    }

    @Override
    public String getWriteableName() {
        return AvgBucketPipelineAggregationBuilder.NAME;
    }

    @Override
    protected void preCollection() {
        count = 0;
        sum = 0;
    }

    @Override
    protected void collectBucketValue(String bucketKey, Double bucketValue) {
        count++;
        sum += bucketValue;
    }

    @Override
    protected InternalAggregation buildAggregation(Map metadata) {
        double avgValue = count == 0 ? Double.NaN : (sum / count);
        return new InternalSimpleValue(name(), avgValue, format, metadata);
    }

}