如何从Java中的聚合存储桶中获取elasticsearch聚合查询结果的值

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.metrics.sum.Sum;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;

public class ElasticsearchAggregationExample {
    public static void main(String[] args) {
        // 创建elasticsearch客户端连接
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder("localhost:9200"));

        // 构建聚合查询请求
        SearchRequest searchRequest = new SearchRequest("your_index");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        searchSourceBuilder.aggregation(
                AggregationBuilders.terms("group_by_field").field("your_field"),
                AggregationBuilders.sum("sum_field").field("your_field"));
        searchRequest.source(searchSourceBuilder);

        try {
            // 执行聚合查询请求
            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

            // 解析聚合结果
            Terms groupByFieldAgg = searchResponse.getAggregations().get("group_by_field");
            Sum sumFieldAgg = searchResponse.getAggregations().get("sum_field");

            // 获取聚合桶中的分组结果
            for (Terms.Bucket bucket : groupByFieldAgg.getBuckets()) {
                String key = bucket.getKeyAsString();
                long docCount = bucket.getDocCount();
                System.out.println("Key: " + key + ", Doc Count: " + docCount);
            }

            // 获取聚合桶中某个字段的总和
            double sumValue = sumFieldAgg.getValue();
            System.out.println("Sum Value: " + sumValue);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭elasticsearch客户端连接
            try {
                client.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}