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[DOCS] Searches on the _type field are no longer supported #78400

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Sep 28, 2021
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[DOCS] Searches on the _type field are no longer supported #78400

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[DOCS] Search on `_type` field matches no docs
jrodewig Sep 28, 2021
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jrodewig Sep 28, 2021
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jrodewig Sep 28, 2021
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17 changes: 17 additions & 0 deletions docs/reference/migration/migrate_8_0/search.asciidoc
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Expand Up @@ -6,6 +6,23 @@
//Installation and Upgrade Guide

//tag::notable-breaking-changes[]
[[_type-search-matches-no-docs]]
.Searches on the `_type` field are no longer supported.
[%collapsible]
====
*Details* +
In 8.x, the `_type` metadata field has been removed. {es} now handles a search
on the `_type` field as a search on a non-existent field. A search on a
non-existent field matches no documents, regardless of the query string.

In 7.x, a search for `_doc` in the `_type` field would match the same documents
as a `match_all` query.

*Impact* +
Remove queries on the `_type` field from your search requests and search
templates. Searches that include these queries may return no results.
====

[[msearch-empty-line-support]]
.The multi search API now parses an empty first line as action metadata in text files.
[%collapsible]
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