PUT /my_index/doc/_bulk?refresh
{"index":{"_id":1}}
{"name":"小明","content":"深圳大廈很高的","age":12}
{"index":{"_id":2}}
{"name":"小明","content":"深圳天氣還是不錯的","age":14}
{"index":{"_id":3}}
{"name":"小紅","content":"深圳交通很棒","age":13}
{"index":{"_id":4}}
{"name":"小明","content":"深圳是很好是吧","age":16}
{"index":{"_id":5}}
{"name":"小春","content":"美女在深圳很多","age":16}
{"index":{"_id":6}}
{"name":"小紅","content":"深圳的帥哥很多","age":16}
 

GET /my_index/_search
{
  "size": 0,
  "aggs": {
    "group_agg":{
      "terms": {
        "field": "name.keyword"
      },
      "aggs": {
        "top_data": {
          "top_hits": {
            "size": 2,
            "sort": [
              {
                "age": {
                  "order": "desc"
                }
              }  
            ],
            "_source": {
              "includes": "content"
            }
          }
        }
      }
    }
  }
}
 

"aggregations": {
    "group_agg": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "小明",
          "doc_count": 3,
          "top_data": {
            "hits": {
              "total": 3,
              "max_score": null,
              "hits": [
                {
                  "_index": "my_index",
                  "_type": "doc",
                  "_id": "4",
                  "_score": null,
                  "_source": {
                    "content": "深圳是很好是吧"
                  },
                  "sort": [
                    16
                  ]
                },
                {
                  "_index": "my_index",
                  "_type": "doc",
                  "_id": "2",
                  "_score": null,
                  "_source": {
                    "content": "深圳天氣還是不錯的"
                  },
                  "sort": [
                    14
                  ]
                }
              ]
            }
          }
        },
        {
          "key": "小紅",
          "doc_count": 2,
          "top_data": {
            "hits": {
              "total": 2,
              "max_score": null,
              "hits": [
                {
                  "_index": "my_index",
                  "_type": "doc",
                  "_id": "6",
                  "_score": null,
                  "_source": {
                    "content": "深圳的帥哥很多"
                  },
                  "sort": [
                    16
                  ]
                },
                {
                  "_index": "my_index",
                  "_type": "doc",
                  "_id": "3",
                  "_score": null,
                  "_source": {
                    "content": "深圳交通很棒"
                  },
                  "sort": [
                    13
                  ]
                }
              ]
            }
          }
        },
        {
          "key": "小春",
          "doc_count": 1,
          "top_data": {
            "hits": {
              "total": 1,
              "max_score": null,
              "hits": [
                {
                  "_index": "my_index",
                  "_type": "doc",
                  "_id": "5",
                  "_score": null,
                  "_source": {
                    "content": "美女在深圳很多"
                  },
                  "sort": [
                    16
                  ]
                }
              ]
            }
          }
        }
      ]
    }
  }
 

結果會發現，top_hits的作用就是在每個組下面的資料進行篩選

size：每組顯示的資料

sort：每組的排序

_source.includes：每組顯示哪些屬性值