ElasticSearch：限制字段值

Question

我正在使用ElasticSearch开展搜索服务。我尝试按字段值限制结果数。例如，我对“user”字段有“评论”（本例中没有父/子），我想用户将“评论”限制搜索为2。

我尝试了一些聚合和toHits，这给了我很好的结果。

"aggs": {
  "agg": {
    "terms": {"field": "user","size":10},
    "aggs": {
      "topHits": { "top_hits": {"size": 2}}
   }
 }

我得到的结果是：

"aggregations": {
"agg": {
  "doc_count_error_upper_bound": 0,
  "sum_other_doc_count": 5,
  "buckets": [
    {
      "key": "user1",
      "doc_count": 5,
      "topHits": {
        "hits": {
          "total": 5,
          "hits": [
            {
              "_index": "idx",
              "_type": "comments",
              "_id": "comment1",
              "_source": {
                "user": "user1",
                "headline": "Bla bla 1"
              }
            },{
              "_index": "idx",
              "_type": "comments",
              "_id": "comment2",
              "_source": {
                "user": "user1",
                "headline": "Bla bla 2"
              }
            }
          ]
        }
      },{
      "key": "user2",
      "doc_count": 1,
      "topHits": {
        "hits": {
          "total": 1,
          "hits": [
            {
              "_index": "idx",
              "_type": "comments",
              "_id": "comment3",
              "_source": {
                "user": "user2",
                "headline": "Bla bla 3"
              }
            }
          ]
        }
      }
    },

但是，如果我这样做，我无法管理目标“字段”，总计数是用户数（而不是评论数）。

您是否知道一个解决方案（可能是post_filter？脚本？）直接在查询中构建过滤器？