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Document removal of freeze index API in migration guide #79801

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Oct 27, 2021
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Document removal of freeze index API in migration guide #79801

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Document removal of freeze index API
danhermann Oct 26, 2021
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danhermann Oct 26, 2021
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16 changes: 16 additions & 0 deletions docs/reference/migration/migrate_8_0/indices.asciidoc
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Expand Up @@ -18,6 +18,22 @@ instead for that purpose.
Requests made to the old `_upgrade` API will return an error.
====

.The deprecated freeze index API has been removed.
[%collapsible]
====
*Details* +
The freeze index API (`POST /<index>/_freeze`) has been removed.
https://www.elastic.co/blog/significantly-decrease-your-elasticsearch-heap-memory-usage[Improvements
in heap memory usage] have eliminated the reason to freeze indices.
You can still unfreeze existing frozen indices using the
{ref}/unfreeze-index-api.html[unfreeze index API]. For some use cases, the
frozen tier may be a suitable replacement for frozen indices. See
{ref}/data-tiers.html[data tiers] for more information.

*Impact* +
Requests made to the old freeze index API will return an error.
====

.The force merge API's `max_num_segments` and `only_expunge_deletes` parameters cannot both be specified in the same request.
[%collapsible]
====
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