elasticsearch - “plain”术语查询与使用过滤器的术语查询之间的区别

Question

我试图了解两者之间的区别:

一个“普通” elasticsearch查询，它将与术语查询匹配，并返回一定数量的匹配。

和一个过滤的查询(因此使用过滤器)将返回相同的匹配数。

这是 术语查询:

GET _search
{
   "query": {
      "terms": {
         "childcareTypes": [
            "SOLE_CHARGE",
            "OUT_OF_SCHOOL",
            "BABY_SITTING"
         ],
         "minimum_match": 3
      }
   }
}

这是 过滤的版本:

GET _search
{
   "query": {
      "filtered": {
         "filter": {
            "terms": {
               "childcareTypes": [
                  "SOLE_CHARGE",
                  "OUT_OF_SCHOOL",
                  "BABY_SITTING"
               ],
               "execution": "and"
            }
         }
      }
   }
}

两者都返回8000总命中率(相对于我的指数)。

这是“普通”字词查询的结果:

{
   "took": 7,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 8000,
      "max_score": 5.134171,
      "hits": [
         {
            "_index": "bignibou",
            "_type": "advertisement",
            "_id": "AUs2T2lt3L5LNr7nkot2",
            "_score": 5.134171,
            "_source": {
               "childcareWorkerType": "AUXILIAIRE_PARENTALE",
               "childcareTypes": [
                  "SOLE_CHARGE",
                  "OUT_OF_SCHOOL",
                  "BABY_SITTING"
               ],
               "address": {
                  "latitude": 48.8532558,
                  "longitude": 2.36584
               },
               "giveBath": "EMPTY"
            }
         },
         ...

这是“已过滤”查询的结果:

{
   "took": 3,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 8000,
      "max_score": 1,
      "hits": [
         {
            "_index": "bignibou",
            "_type": "advertisement",
            "_id": "AUs2T2lt3L5LNr7nkot2",
            "_score": 1,
            "_source": {
               "childcareWorkerType": "AUXILIAIRE_PARENTALE",
               "childcareTypes": [
                  "SOLE_CHARGE",
                  "OUT_OF_SCHOOL",
                  "BABY_SITTING"
               ],
               "address": {
                  "latitude": 48.8532558,
                  "longitude": 2.36584
               },
               "giveBath": "EMPTY"
            }
         },
         ....

那么两者之间有什么区别？

Answer 1

这与查询和过滤器(more information here)之间的差异有关。

在您的情况下，与terms查询不同，terms过滤器:

是缓存的

不计算分数:所有匹配的文档的_score为1(查看结果)

因此，最大的区别是 filtered查询将比“普通” terms查询更快。