java - 使用 ElasticsearchTemplate 和聚合器获取聚合值

Question

我在提取聚合值时遇到问题。

配置是 spring 和 spring-boot-starter-data-elasticsearch。

文档用户在数据库中多次索引。

我想返回字段“commentsCnt”的总和

@Autowired
ElasticsearchTemplate elasticsearchTemplate;

SearchQuery searchQuery = new NativeSearchQueryBuilder()
    .withIndices("comment")             
    .withQuery(matchQuery("user", userName))       
    .addAggregation(AggregationBuilders.sum("sum_of_comments").field("commentsCnt"))
    .build();

Aggregations aggregations = elasticsearchTemplate.query(searchQuery, 
        new ResultsExtractor<Aggregations>() {
            @Override
            public Aggregations extract(SearchResponse response) {
                return response.getAggregations();
        }
});

Aggregation ret = aggregations.get("sum_of_comments");

如何提取值？也许有更好的方法？

Answer 1

    for (Aggregation aggs : aggregations) {

         Sum sum = (Sum) aggs;
         double sumValue = sum.getValue();
          System.out.println("sumValue=" + sumValue);
  }