[DOCS] Mark unfreeze API as deprecated (#73505)

elastic · May 28, 2021 · 7dd8fb7 · 7dd8fb7
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diff --git a/docs/reference/indices/apis/unfreeze.asciidoc b/docs/reference/indices/apis/unfreeze.asciidoc
@@ -6,6 +6,8 @@
 <titleabbrev>Unfreeze index</titleabbrev>
 ++++
 
+deprecated::[7.14, Frozen indices are no longer useful due to https://www.elastic.co/blog/significantly-decrease-your-elasticsearch-heap-memory-usage[recent improvements in heap memory usage].]
+
 Unfreezes an index.
 
 [[unfreeze-index-api-request]]