Elasticsearch中的自定义评分功能不会返回预期的字段值 [英] Custom scoring function in Elasticsearch does not return expected field value

问题描述

我为我的文档创建一个自定义评分函数，它只是为每个文档返回字段 a 的值。但是由于某些原因，在下面的示例中，结果中 _score 的最后一位数字与 a 为每个文档。这里发生了什么？

  PUT test / doc / 1 
 {
a：851459198 
} 
 
 PUT test / doc / 2 
 {
a：984968088 
} 
 
 GET test / _search 
 {
query：{
function_score：{
script_score：{
script：{
inline：doc [\a\]。value
} 
} 
} 
} 
} 
  pre> 
 
 
这将返回以下内容：
  {
take：16，
timed_out：false，
_shards：{
total：5，
success：5，
 $$$$$$$$$$$$$$$$ b $ b {
_index：test，
_type：doc，
_id：2，
_score：984968060， 
_source：{
a：984968088 
} 
}，
 {
_index：test，
_type：doc，
_id：1，
_score：851459200，
_source：{
a 851459198 
} 
} 
] 
} 
} 
  
为什么 _score 与字段值 a 不同？
 
 
 
我正在使用Elasticsearch 2.1.1 
解决方案
  _score 值是内部硬编码为浮点数，只能精确地表示整数，直到值为134217728.因此，如果要在得分函数中使用存储为大于那将会溢出缓冲区并被截断。请参阅此github问题 
 
I create a custom scoring function for my documents that just returns the value of the field a for each document. But for some reason, in the example below, the last digits of the _score in the results differ from the last digits of the value of a for each document. What is happening here?
PUT test/doc/1
{
  "a": 851459198
}

PUT test/doc/2
{
  "a": 984968088
}

GET test/_search
{
  "query": {
    "function_score": {
      "script_score": {
        "script": {
          "inline": "doc[\"a\"].value"
        }
      }
    }
  }
}
That will return the following:
{
  "took": 16,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 984968060,
    "hits": [
      {
        "_index": "test",
        "_type": "doc",
        "_id": "2",
        "_score": 984968060,
        "_source": {
          "a": 984968088
        }
      },
      {
        "_index": "test",
        "_type": "doc",
        "_id": "1",
        "_score": 851459200,
        "_source": {
          "a": 851459198
        }
      }
    ]
  }
}
Why is the _score different than the value of the field a?

I'm using Elasticsearch 2.1.1
解决方案
The _score value is internally hard coded as a float which can only accurately represent integers up to the value 134217728. Therefore, if you want to make use, in the scoring function, of a field stored as a number larger than that, it will overflow the buffer and be truncated. See this github issue

                        
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