Elasticsearch功能评分查询得分

Question

我有我已经简化到这样的查询：

GET /foos-33/_search 
{ 
    "from" : 0, 
    "size" : 25, 
    "query" : { 
    "function_score" : { 
     "query" : { 
     "bool" : { 
      "filter" : { 
      "bool" : { 
       "must" : [ { 
       "bool" : { 
        "must_not" : { 
        "terms" : { 
         "foo.id" : [ ] 
        } 
        } 
       } 
       } ] 
      } 
      } 
     } 
     }, 
     "functions" : [ { 
     "field_value_factor" : { 
      "field" : "foo.strategicBoost", 
      "missing" : 1.0 
     } 
     } ], 
     "score_mode" : "sum" 
    } 
    }, 
    "explain" : true, 
    "sort" : [ { 
    "counts.barsPerDay" : { 
     "order" : "desc" 
    } 
    } ] 
} 

命中的得分始终为零。解释输出排序显示为什么发生这种情况，但我不完全理解这是怎么回事：

 "_explanation": { 
      "value": 0, 
      "description": "function score, product of:", 
      "details": [ 
       { 
       "value": 0, 
       "description": "ConstantScore(-() +*:*), product of:", 
       "details": [ 
        { 
         "value": 0, 
         "description": "boost", 
         "details": [] 
        }, 
        { 
         "value": 1, 
         "description": "queryNorm", 
         "details": [] 
        } 
       ] 
       }, 
       { 
       "value": 10, 
       "description": "min of:", 
       "details": [ 
        { 
         "value": 10, 
         "description": "field value function: none(doc['foo.strategicBoost'].value?:1.0 * factor=1.0)", 
         "details": [] 
        }, 
        { 
         "value": 3.4028235e+38, 
         "description": "maxBoost", 
         "details": [] 
        } 
       ] 
       } 
      ] 
     } 
    }, 

我试图把它包在constant_score从0常数比分改为1，这样的：

GET /foos-33/_search 
{ 
    "from" : 0, 
    "size" : 25, 
    "query" : { 
    "function_score" : { 
     "query" : { 
     "bool" : { 
      "constant_score": { 
       "boost": 1, 
      "filter" : { 
      "bool" : { 
       "must" : [ { 
       "bool" : { 
        "must_not" : { 
        "terms" : { 
         "foo.id" : [ ] 
        } 
        } 
       } 
       } ] 
      } 
      } 
      } 
     } 
     }, 
     "functions" : [ { 
     "field_value_factor" : { 
      "field" : "foo.strategicBoost", 
      "missing" : 1.0 
     } 
     } ], 
     "score_mode" : "sum" 
    } 
    }, 
    "explain" : true, 
    "sort" : [ { 
    "counts.barsPerDay" : { 
     "order" : "desc" 
    } 
    } ] 
} 

但是这给了我一个错误信息：

"failed_shards": [ 
    { 
     "shard": 0, 
     "index": "foos-33", 
     "node": "A9s2Ui3mQE2SBZhY2VkZGw", 
     "reason": { 
      "type": "query_parsing_exception", 
      "reason": "[bool] query does not support [constant_score]", 
      "index": "foos-33", 
      "line": 8, 
      "col": 29 
     } 
    } 
    ] 

还有另一种方法我可以尝试解决这个问题 - 我可以尝试到product更改为sum或东西 - 但我无法揣摩出product的来源。

Answer 1

顶层“的产物”来自boost_mode，默认为multiply。设置boost_mode到replace在这种情况下，正确的修复 - 查询成绩永远是零，所以我们不关心它。设置boost_mode到sum会在这种情况下一个同样有效修复了。