tophits JAVA API的Elasticsearch子聚合不起作用

Question

我想在JAVA API中编写elasticsearch聚合代码，以查找字段折叠和结果分组。

json聚合代码如下所示，我从elasticsearch文档中获得了这些代码

“dedup\u by\u score”聚合具有称为“top\u hit”聚合的子聚合，并将此聚合用于桶排序。

... some query
  "aggs": {
    "dedup_by_score": {
      "terms": {
        "field": "keyword",
        "order": {
          "top_hit": "desc"
        },
        "size": 10
      },
      "aggs": {
        "top_hit": {
          "max": {
            "script": {
              "source": "_score"
            }
          }
        }
      }
    }
  }

我想将这个json查询转换为JAVA

这是我已经在JAVA中尝试过的

AggregationBuilder aggregation = AggregationBuilders.terms("dedup_by_score")
    .field("keyword")
    .order(BucketOrder.aggregation("top_hit", false))
    .size(10)
    .subAggregation(
        AggregationBuilders.topHits("top_hit")
        .subAggregation(
            AggregationBuilders.max("max").script(new Script("_score"))
        )
    );

但是我从Elasticsearch得到了如下错误

{
"type":"aggregation_initialization_exception",
"reason":"Aggregator [top_hit] of type [top_hits] cannot accept sub-aggregations"
}

如何修复此Java代码？我现在使用Elasticsearch 6.7.1版本。

提前谢谢

Answer 1

热门AGG不能有子AGG。尝试以下操作：

AggregationBuilder aggregation = AggregationBuilders.terms("dedup_by_score")
        .field("keyword")
        .order(BucketOrder.aggregation("top_hit", false))
        .size(10)
        .subAggregation(
            AggregationBuilders.max("max").script(new Script("_score"))
                .subAggregation(
                    AggregationBuilders.topHits("top_hit")
                )
        );