是否可以通过Elasticsearch聚合的键对结果进行分组？

我猜你试图通过elasticsearch中的一个字段进行分组,你可以通过使用术语聚合来实现.

以下是使用查询dsl的方法,

POST _search 
{
   "aggs": {
      "genders": {
         "terms": {
            "field": "gender"
         },
         "aggs": {
            "top_tag_hits": {
               "top_hits": {
                  "_source": {
                     "include": [
                        "include_fields_name"
                     ]
                  },
                  "size": 100
               }
            }
         }
      }
   }
}

和性别是文档中的字段,它的响应可以

{
    ...

    "aggregations" : {
        "genders" : {
            "buckets" : [
                {
                    "key" : "male",
                    "doc_count" : 10,
                    "tag_top_hits":{"hits":...}
                },
                {
                    "key" : "female",
                    "doc_count" : 10,
                    "tag_top_hits":{"hits":...}
                },
            ]
        }
    }
}

使用Java api,我为你的评论添加了tophits聚合.(但不在查询dsl中)

client.prepareSearch("index").setTypes("types").addAggregation(
                AggregationBuilders.terms("agg_name").field("gender").subAggregation(
                        AggregationBuilders.topHits("documents").setSize(10)
                )
        ).execute(new ActionListener<SearchResponse>() {
            @Override
            public void onResponse(SearchResponse response) {
                Terms agg_name_aggregation=response.getAggregations().get("agg_name");
                for (Terms.Bucket bucket : agg_name_aggregation.getBuckets()) {
                    TopHits topHits=bucket.getAggregations().get("documents");
                    System.out.println("term = " + bucket.getKey());
                    // do what you want with top hits..
                }
            }

            @Override
            public void onFailure(Throwable e) {
                e.printStackTrace();
            }
        });

希望这可以帮助!!