这个聚合使用于做分桶后的过滤的，父聚合传下来的参数需要为数值型，聚合中的script需要返回一个布尔型的结果

语法

{
    "bucket_selector": {
        "buckets_path": {
            "my_var1": "the_sum", 
            "my_var2": "the_value_count"
        },
        "script": "params.my_var1 > params.my_var2"
    }
}

参数

#示例 返回按月聚合后销售额大于400的结果

POST /sales/_search
{
    "size": 0,
    "aggs" : {
        "sales_per_month" : {
            "date_histogram" : {
                "field" : "date",
                "interval" : "month"
            },
            "aggs": {
                "total_sales": {
                    "sum": {
                        "field": "price"
                    }
                },
                "sales_bucket_filter": {
                    "bucket_selector": {
                        "buckets_path": {
                          "totalSales": "total_sales"
                        },
                        "script": "params.totalSales > 200"
                    }
                }
            }
        }
    }
}

返回结果

{
   "took": 11,
   "timed_out": false,
   "_shards": ...,
   "hits": ...,
   "aggregations": {
      "sales_per_month": {
         "buckets": [
            {
               "key_as_string": "2015/01/01 00:00:00",
               "key": 1420070400000,
               "doc_count": 3,
               "total_sales": {
                   "value": 550.0
               }
            },
            {
               "key_as_string": "2015/03/01 00:00:00",
               "key": 1425168000000,
               "doc_count": 2,
               "total_sales": {
                   "value": 375.0
               },
            }
         ]
      }
   }
}