The new version of es "_count" doesn't support post_filter

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I just want the count, But now, I have to use _search to get the count.

Hmm. Sounds like I was wrong. _count API still exists: Count API | Elasticsearch Reference [5.4] | Elastic

What has been removed is search_type=count: Search and Query DSL changes | Elasticsearch Reference [5.4] | Elastic

I think it's perfectly to call _search with size: 0. It will behave like a count actually.