如果筛选器在筛选查询内部或外部，是否重要？ [英] Does it matter if the filter is inside or outside a filtered query?

问题描述

虽然这两者给了我相同的结果，但内部或外部的过滤器有什么区别？在表现或幕后行为方面有差异吗？

While these two are giving me the same result, what is the difference between having the filter inside or outside? Is there a difference in terms of performance or the actions behind the scenes?

"query": {
    "filtered": {
        "query":  { "match": { "email": "business opportunity" }},
        "filter": { "term":  { "folder": "inbox" }}
    }
}

"query": {
    "filtered": {
    "query":  { "match": { "email": "business opportunity" }}
    }
},
"filter": {
    "term":  { "folder": "inbox" }
}

推荐答案

在查询

内过滤

弹性搜索将执行查询并过滤出更多的方式有效地减少结果集，并尽可能快地得到答案。
这被称为 filtered_query

查询首先运行， strong> then 结果将被过滤，然后返回到客户端。
这被称为 post_filter 。

The query is run first and then results are filtered before returning them to the client. This is referred to as a post_filter.

虽然post_filter效率较低，但与聚合组合时可能会很有用 - 聚合值不会占用帐户post_filter，即聚合只会在查询结果上。

Although a post_filter is less efficient, it can be useful when combining with an aggregation - the aggregated values won't take into account the post_filter, i.e. the aggregation will only be on the query results.

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