我正在尝试获取以下Elasticsearch查询的结果。我得到了如下所示的响应。现在，我想根据点击率最高的文档字段“源”来选择存储桶。

POST /data/_search?size=0{ 
   "aggs":{ 
      "by_partyIds":{ 
         "terms":{ 
            "field":"id.keyword"
         },"aggs":{ 
            "oldest_record":{ 
               "top_hits":{ 
                  "sort":[ 
                     { 
                        "createdate.keyword":{ 
                           "order":"asc"
                        }
                     }
                  ],"_source":[ 
                     "source"
                  ],"size":1
               }
            }
         }
      }
   }
}

响应：

{
              "aggregations": {
                "by_partyIds": {
                  "doc_count_error_upper_bound": 0,"sum_other_doc_count": 0,"buckets": [
                    {
                      "key": "1","doc_count": 3,"oldest_record": {
                        "hits": {
                          "total": 3,"max_score": null,"hits": [
                            {
                              "_index": "data","_type": "osr","_id": "DcagSm4B9Wnm0Ke-MgGk","_score": null,"_source": {
                                "source": "US"
                              },"sort": [
                                "20-09-18 05:45:26.000000000AM"
                              ]
                            }
                          ]
                        }
                      }
                    },{
                      "key": "2","_id": "7caiSm4B9Wnm0Ke-HwGx","_source": {
                                "source": "UK"
                              },"sort": [
                                "22-09-18 05:45:26.000000000AM"
                              ]
                            }
                          ]
                        }
                      }
                    }
                  ]
                }
              }
            }

现在我想获得以美国为来源的水桶。我们可以为此编写查询吗？我尝试了桶聚合，它是父管道聚合，它执行一个脚本，该脚本确定当前桶是否将保留在父多桶聚合中。指定的指标必须为数字，并且脚本必须返回布尔值。如果脚本语言是表达式，则允许使用数字返回值。在这种情况下，0.0将被评估为false，所有其他值将被评估为true。