使用高斯衰减分数函数时，它总是在嵌套元素上得分 1

Question

对于

这样的文档

{
"_id" : "abc123",
"_score" : 3.7613528,
"_source" : {
    "id" : "abc123",
    "pricePeriods" : [{
            "periodTo" : "2016-01-02",
            "eur" : 1036,
            "gbp" : 782,
            "dkk" : 6880,
            "sek" : 9025,
            "periodFrom" : "2015-12-26",
            "nok" : 8065
        }, {
            "periodTo" : "2016-06-18",
            "eur" : 671,
            "gbp" : 457,
            "dkk" : 4625,
            "sek" : 5725,
            "periodFrom" : "2016-01-02",
            "nok" : 5430
        }       ]

 }
}

我想对价格进行高斯衰减函数评分。

我试过这样

"query" : {
    "function_score" : {
        "functions" : [{
                "gauss" : {
                    "pricePeriods.dkk" : {
                        "origin" : "2500",
                        "scale" : "2500",
                        "decay" : 0.8

                    }
                },
                "filter" : {
                    "nested" : {
                        "filter" : {
                            "range" : {
                                "pricePeriods.periodTo" : {
                                    "gte" : "2016-03-17T00:00:00.000"
                                }
                            }

                        },
                        "path" : "pricePeriods"

                    }
                }
            }
            ]

过滤器似乎找到了我想要高斯的价格，但结果分数始终为 1。

解释说

{ "value": 1,
  "description": "min of:",
   "details": [
    {
         "value": 1,
         "description": "function score, score mode [multiply]",
          "details": [
                    {
              "value": 1,
               "description": "function score, product of:",
                 "details": [
                  {
                    "value": 1,
                       "description": "match filter: ToParentBlockJoinQuery (+ConstantScore(pricePeriods.periodTo:[[32 30 31 36 2d 30 33 2d 31 37 54 30 30 3a 30 30 3a 30 30 2e 30 30 30] TO *]) #QueryWrapperFilter(_type:__pricePeriods))",
                                         "details": []
                                      },
                                      {
                                         "value": 1,
                                         "description": "Function for field pricePeriods.dkk:",
                                         "details": [
                                            {
                                               "value": 1,
                                               "description": "exp(-0.5*pow(MIN[0.0],2.0)/1.4004437867889222E7)",
                                               "details": []
                                            }
                                         ]
                                      }
                                   ]
                                }
                             ]
                          }

我可以看到 here gauss 显然 returns 1 找不到字段。但问题是为什么它在嵌套文档中找不到该字段以及如何解决这个问题。

Answer 1

gauss function 返回 1 的原因是因为正如您所说，它找不到 nested 字段，您基本上需要将整个 function_score 查询包装成nested query

{
  "query": {
    "nested": {
      "path": "pricePeriods",
      "query": {
        "function_score": {
          "functions": [
            {
              "gauss": {
                "pricePeriods.dkk": {
                  "origin": "2500",
                  "scale": "2500",
                  "decay": 0.8
                }
              },
              "filter": {
                "range": {
                  "pricePeriods.periodTo": {
                    "gte": "2016-03-17T00:00:00.000"
                  }
                }
              }
            }
          ]
        }
      }
    }
  }
}

这有帮助吗？

使用高斯衰减分数函数时，它总是在嵌套元素上得分 1

When using gauss decay score funtion, it always scores 1 on nested elements

nested

gaussian

elasticsearch