过滤器是在过滤查询的内部还是外部有关系吗? [英] Does it matter if the filter is inside or outside a filtered query?

问题描述

虽然这两个给我相同的结果，但在内部或外部使用过滤器有什么区别?在性能或幕后操作方面有区别吗?

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

在查询中过滤

Elasticsearch 将以更有效的方式执行查询和过滤，以减少结果集并尽快为您提供答案.这称为 过滤查询

首先运行查询，然后然后过滤结果，然后将它们返回给客户端.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，但它在与聚合结合时很有用 - 聚合值不会考虑 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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