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[DOCS] Add deprecation docs for xpack.searchable.snapshot.shared_cache.size #77727

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Sep 15, 2021
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[DOCS] Add deprecation docs for xpack.searchable.snapshot.shared_cache.size #77727

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26 changes: 24 additions & 2 deletions docs/reference/migration/migrate_7_12.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ See also <<release-highlights>> and <<es-release-notes>>.
* <<breaking_712_engine_changes>>
* <<breaking_712_search_changes>>
* <<breaking_712_ssl_changes>>
* <<breaking_712_settings_deprecations>>

//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide
Expand Down Expand Up @@ -87,8 +88,8 @@ For instructions on how to enable these older TLS versions in your {es} cluster,
see {ref}/jdk-tls-versions.html#jdk-enable-tls-protocol[Enabling additional
SSL/TLS versions on your JDK].
====
//end::notable-breaking-changes[]

////
[discrete]
[[deprecated-7.11]]
=== Deprecations
Expand All @@ -104,4 +105,25 @@ the old behavior is supported until the next major release.
To find out if you are using any deprecated functionality,
enable <<deprecation-logging, deprecation logging>>.

////
//tag::notable-breaking-changes[]
[discrete]
[[breaking_712_settings_deprecations]]
==== Settings deprecations

[[deprecate-searchable_snapshot_shared_cache_size]]
.Setting `xpack.searchable.snapshot.shared_cache.size` on non-frozen nodes is deprecated.
[%collapsible]
====
*Details* +
Setting `xpack.searchable.snapshot.shared_cache.size` to a positive value on a
node without the `data_frozen` role is now deprecated.

The `xpack.searchable.snapshot.shared_cache.size` node setting reserves space
for a shared cache used by partially mounted {search-snap} indices. {es} only
allocates partially mounted indices to nodes with the `data_frozen` role.

*Impact* +
To avoid deprecation warnings, discontinue use of the setting on non-frozen
nodes.
====
//end::notable-breaking-changes[]