Elasticsearch:嵌套查询中的脚本字段

Question

有没有办法在嵌套查询中使用“script_fields”，将字段添加到返回的inner_hits？例：

{
   "nested": {
      "inner_hits": {},
      "path": "companies",
      "score_mode": "sum",
      "query": {},
      "script_fields": {
         "overlap" : {
            "script": {
               "source": "................................",
               "params": {
                   "from": "2012-01-01",
                    "to": "2015-06-30"
                }
            }
         }                
      }         
}

我执行n个嵌套查询，向每个嵌套查询传递一组特定的参数。这个想法是让源脚本根据提供的参数为每个内部命中的重叠字段分配一个值。

看起来在同一嵌套路径上执行更多的嵌套查询，定义不同的inner_hits使 ES 去除inner_hits匹配项。例：

{
       "nested": {
          "inner_hits": {
            "script_fields": {
               "overlap" : {
                  "script": {
                     "source": "................................",
                        "params": {
                           "from": "2012-01-01",
                           "to": "2015-06-30"
                         }
                      }
                   }                
                 } 
          },
          "path": "companies",
          "score_mode": "sum",
          "query": {},

    },
    {
       "nested": {
          "inner_hits": {
            "script_fields": {
               "overlap" : {
                  "script": {
                     "source": "................................",
                        "params": {
                           "from": "2012-01-01",
                           "to": "2015-06-30"
                         }
                      }
                   }                
                 } 
          },
          "path": "companies",
          "score_mode": "sum",
          "query": {},

    } 

如果像这样运行更多的嵌套查询，我会得到正确的匹配项，但不会返回所有预期的inner_hits。我只能获得所有命中，只为不同的inner_hits随机命名，例如：

"inner_hits": {
   "name": [random name]
   "script_fields": {
      "overlap" : {
         ......
      }
    }
 }   

然后我得到了正确的命中结果，但有一些缺点。我必须检查重复的结果，因为命中被添加到不同的结果集并且不再是uniq。我必须使用正则表达式来解析结果以重新构建统一列表。

这听起来像虫子吗？

Answer 1

是的，这是可行的。您只需将< code>script_fields部分移到< code>inner_hits中，如下所示:

{
   "nested": {
      "path": "companies",
      "score_mode": "sum",
      "query": {}.
      "inner_hits": {
         "script_fields": {
           "overlap" : {
             "script": {
               "source": "................................",
               "params": {
                   "from": "2012-01-01",
                    "to": "2015-06-30"
               }
             }
           }                
         }     
      }
   }              
}