如何按分数

Question

以下elasticsearch查询按单term分组，并根据自定义评分函数对存储桶进行排序：

GET /my-index/_search
{
  "size": 0,
  "query": {
    "function_score": {
      "score_mode": "sum",
      "functions": [
        {
          "weight": 5,
          "gauss": {
            "relevant_at": {
              "scale": "31d"
            }
          }
        },
        {
          "weight": 2,
          "gauss": {
            "relevant_at": {
              "scale": "365d"
            }
          }
        }
      ],
      "query": {
        "multi_match": {
          "fields": [
            "admit_email",
            "admit_name",
            "scan_code"
          ],
          "query": "my-query",
          "type": "phrase_prefix",
          "operator": "and"
        }
      }
    }
  },
  "aggs": {
    "by_order": {
      "terms": {
        "field": "order_id",
        "size": 20,
            "order": {
              "max_score": "desc"
            }
      },
      "aggs": {
        "max_score": {
            "max": {
              "script": "_score"
            }
        }
       }
      }
    }
  }
}

我想添加第二个terms分组。下一个查询在语法上是合法的，但它只根据_score对子桶进行排序。返回的桶不是得分最高的桶，也不是正确的顺序：

GET /my-index/_search
{
  "size": 0,
  "query": {
    "function_score": {
      "score_mode": "sum",
      "functions": [
        {
          "weight": 5,
          "gauss": {
            "relevant_at": {
              "scale": "31d"
            }
          }
        },
        {
          "weight": 2,
          "gauss": {
            "relevant_at": {
              "scale": "365d"
            }
          }
        }
      ],
      "query": {
        "multi_match": {
          "fields": [
            "admit_email",
            "admit_name",
            "scan_code"
          ],
          "query": "my-query",
          "type": "phrase_prefix",
          "operator": "and"
        }
      }
    }
  },
  "aggs": {
    "by_order": {
      "terms": {
        "field": "order_id",
        "size": 20
      },
      "aggs": {
        "by_session": {
          "terms": {
            "field": "event_session_id",
            "order": {
              "max_score": "desc"
            }
          },
          "aggs": {
            "max_score": {
              "max": {
                "script": "_score"
              }
            }
          }
        }
      }
    }
  }
}

我尝试了许多返回此错误的类似查询：

{
  "error": {
    "root_cause": [
      {
        "type": "aggregation_initialization_exception",
        "reason": "Aggregator [max_score] of type [max] cannot accept sub-aggregations"
      }
    ],
    "type": "aggregation_initialization_exception",
    "reason": "Aggregator [max_score] of type [max] cannot accept sub-aggregations"
  },
  "status": 500
}

我见过，正在使用@Veneeth Mohan的script approach。它有效，但我觉得应该有一种没有连接的方法。