elasticsearch best_field和most_field有什么区别 [英] elasticsearch what is the difference between best_field and most_field

问题描述

我已经准备好这篇文章
https://www.elastic.co/guide/zh-CN/elasticsearch/reference/current/query-dsl-multi-match-query.html

I already ready this article https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-multi-match-query.html

但我自己也无法弄清楚。

but couldn't figure it out myself.

让我们执行以下两个查询：

lets have these two queries:

第一

GET blablabla/_search
{
  "query": {
    "multi_match": {
      "query": "games usa",
      "fields": ["title1", "title2"],
      "type": "best_fields"
    }
  }
}

second

get blablabla/_search
{
  "query" : {
    "multi_match": {
      "query": "games usa",
      "fields": ["title1", "title2"],
      "type": "most_fields"
    }
  }
}

我认为第一个查询的意思是：

I think the first query means:

获取在title1或title2字段中包含（游戏）或（美国）或（游戏和美国）单词的文档。

get documetns that contain (games) or (usa) or (games and usa) words in either the title1 or the title2 fields.

但是，我不知道第二个是什么意思。

However, I don't know what does the second one mean.

可能我需要帮助吗？

（基于Elasticsearch 2.2）

(im on elasticsearch 2.2)

推荐答案

每当在 Elastic Search 中执行搜索操作时，都会计算每个匹配文档的相关性。根据文档-

Whenever search operation is performed in Elastic Search, relevance of each matched document is calculated.According to th documentation-

每个文档的相关性得分由一个正浮点数表示，该正浮点数称为 _score 。 _score越高，文档越相关。

The relevance score of each document is represented by a positive floating-point number called the _score. The higher the _score, the more relevant the document.

根据上述示例

GET blablabla/_search
{
"query": {
"multi_match": {
  "query": "games usa",
  "fields": ["title1", "title2"],
  "type": "best_fields"
   }
  }
}

此查询将查找包含游戏 <在 title1 或 title2 AND / OR 美国 $ c>，但 _score 将根据单个最佳匹配字段进行计算。例如-

This query will find the documents which contain games AND/OR usa in title1 or title2 but _score will be calculated from single best matching field. For example-

• 如果 title1 包含个游戏和 title2 在同一文档中包含 games USA ，然后是 _score 将是 title2 中的那个。


• best_fields 在搜索同一字段中最能找到的多个单词时最有用。

• if title1 contains games and title2 contains games usa in the same document, then _score will be the one from title2.
• best_fields is most useful when you are searching for multiple words best found in the same field.

在 most_fields ：

GET blablabla/_search
{ 
"query" : {
"multi_match": {
  "query": "games usa",
  "fields": ["title1", "title2"],
  "type": "most_fields"
   }
  }
}

此查询将查找包含游戏 和/或 美国在 title1 或 title2 ，但 _score 将根据所有字段的组合计算得出。例如-

This query will find the documents which contain games AND/OR usa in title1 or title2 but _score will be calculated from the combination of all the fields. For example-

• 如果 title1 包含个游戏和 title2 在同一文档中包含 games USA ，然后 _score 将是 title1 和 title2

• if title1 contains games and title2 contains games usa in the same document, then _score will be combination of scores from title1 and title2

希望这会有所帮助

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