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[DOCS] Document empty first line support for msearch API #78284

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[DOCS] Document empty first line support for msearch API #78284

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[DOCS] Document empty first line support for msearch API
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19 changes: 19 additions & 0 deletions docs/reference/migration/migrate_8_0/search.asciidoc
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Expand Up @@ -6,6 +6,25 @@
//Installation and Upgrade Guide

//tag::notable-breaking-changes[]
[[msearch-empty-line-support]]
.The multi search API now parses an empty first line as action metadata in text files.
[%collapsible]
====
*Details* +
The multi search API now parses an empty first line as empty action metadata
when you provide a text file as the request body, such as when using curl's
`--data-binary` flag.

The API no longer supports text files that contain:

* An empty first line followed by a line containing only `{}`.
* An empty first line followed by another empty line.

*Impact* +
Don't provide an unsupported text file to the multi search API. Requests that
include an unsupported file will return an error.
====

[[remove-unmapped-type-string]]
.The `unmapped_type: string` sort option has been removed.
[%collapsible]
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