sorting - 文档的重新评分和排序

Question

我的目标是编写一个查询，该查询将根据文档中某个字段的值对文档进行重新评分。为此，我使用了重新评分查询，然后对结果进行排序。但是，对查询的解释告诉我，文档的排序是根据先前计算的分数而不是新分数完成的。

我看到以下说明我不能同时使用 rescore 和 sort。

“有时我们想显示结果，页面上第一个文档的顺序受到附加规则的影响。不幸的是，这不能通过重新评分功能来实现。第一个想法指向 window_size 参数，但这个参数在fact 与结果列表中的第一个文档无关，但与每个分片上返回的结果数有关。此外 window_size 不能小于页面大小。(如果小于，ElasticSearch 会自动使用页面大小)。另外，一个非常重要的事情 – 重新评分不能与排序相结合，因为排序是在重新评分引入的更改之后完成的。”

http://elasticsearchserverbook.com/elasticsearch-0-90-using-rescore/

我的查询是:

{
"query": {
    "filtered": {
        "query": {
            "bool": {
                "should": [
                    {
                        "constant_score": {
                            "query": {
                                "match": {
                                    "question": {
                                        "query": "diabetes"
                                    }
                                }
                            },
                            "boost": 1
                        }
                    },
                    {
                        "dis_max": {
                            "queries": [
                                {
                                    "constant_score": {
                                        "query": {
                                            "match": {
                                                "question": {
                                                    "query": "diabetes"
                                                }
                                            }
                                        },
                                        "boost": 0.01
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "match": {
                                                "answer_text": {
                                                    "query": "diabetes"
                                                }
                                            }
                                        },
                                        "boost": 0.0001
                                    }
                                }
                            ]
                        }
                    },
                    {
                        "dis_max": {
                            "queries": [
                                {
                                    "constant_score": {
                                        "query": {
                                            "match_phrase": {
                                                "question_phrase": {
                                                    "query": "what is diabetes",
                                                    "slop": 0
                                                }
                                            }
                                        },
                                        "boost": 100
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "match_phrase": {
                                                "question_phrase": {
                                                    "query": "what is diabetes",
                                                    "slop": 1
                                                }
                                            }
                                        },
                                        "boost": 50
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "match_phrase": {
                                                "question_phrase": {
                                                    "query": "what is diabetes",
                                                    "slop": 2
                                                }
                                            }
                                        },
                                        "boost": 33
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "match_phrase": {
                                                "question_phrase": {
                                                    "query": "what is diabetes",
                                                    "slop": 3
                                                }
                                            }
                                        },
                                        "boost": 25
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "question_group_four",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 0.1
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "question_group_five",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 0.15
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_no_synonyms_20",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 35
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_no_synonyms_15",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 25
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_no_synonyms_10",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 15
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_20",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 28
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_15",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 16
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_10",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 13
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_05",
                                                "query": "what__is__diabetes"
                                            }
                                        },
                                        "boost": 4
                                    }
                                }
                            ]
                        }
                    },
                    {
                        "dis_max": {
                            "queries": [
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "question_group_four",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 0.1
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "question_group_five",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 0.15
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_no_synonyms_20",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 35
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_no_synonyms_15",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 25
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_no_synonyms_10",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 15
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_20",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 28
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_15",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 16
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_10",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 13
                                    }
                                },
                                {
                                    "constant_score": {
                                        "query": {
                                            "query_string": {
                                                "default_field": "concept_words_05",
                                                "query": "diabetes"
                                            }
                                        },
                                        "boost": 4
                                    }
                                }
                            ]
                        }
                    }
                ],
                "disable_coord": true
            }
        },
        "filter": {
            "and": [
                {
                    "term": {
                        "posted_by_expert": false
                    }
                },
                {
                    "term": {
                        "tip_question": false
                    }
                },
                {
                    "term": {
                        "show_in_work_queue": true
                    }
                },
                {
                    "range": {
                        "verified_answers_count": {
                            "gt": 0
                        }
                    }
                }
            ]
        }
    }
},
"rescore": {
    "window_size": 100,
    "query": {
        "rescore_query": {
            "function_score": {
                "functions": [
                    {
                        "script_score": {
                            "script": "_score * _source.concierge_boost"
                        }
                    }
                ]
            }
        }
    }
},
"sort": [
    "_score",
    {
        "count_words_with_high_concepts": {
            "order": "asc"
        }
    },
    {
        "popularity": {
            "order": "desc"
        }
    },
    {
        "length": {
            "order": "asc"
        }
    }
],
"fields": [],
"size": 10,
"from": 0

非常感谢任何帮助!

Answer 1

这确实是不可能的。 But this has been discussed并决定目前不值得实现。不过，github 上的讨论揭示了这方面的困难——需要对文档进行排序，选择前 100 个(在你的情况下)，然后应用重新评分，然后再次对它们进行排序。我建议阅读该 github 问题中的评论，尤其是来自 simonw 的评论。这个问题仍然悬而未决，但似乎不会很快实现，如果有的话。

关于您在另一级评分后的排序，我理解只需要对少数文档进行重新评分，但这似乎是不可能的。如果您将查询包装在另一个 function_score 中，您在其中定义了一个 script_score 函数来计算最终分数，会怎样？像这样:

{
  "query": {
    "function_score": {
      "query": {
        .......
      },
      "functions": [
        {
          "script_score": {
            "script": "doc['concierge_boost'].value"
          }
        }
      ]
    }
  },
  "sort": [
    "_score",
    {
        "count_words_with_high_concepts": {
            "order": "asc"
        }
    },
    {
        "popularity": {
            "order": "desc"
        }
    },
    {
        "length": {
            "order": "asc"
        }
    }
  ],
  "fields": [],
  "size": 10,
  "from": 0
}