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Clarify same indices requests are blocked #80228

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Jul 21, 2022
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Clarify same indices requests are blocked #80228

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10 changes: 7 additions & 3 deletions docs/reference/indices/forcemerge.asciidoc
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Expand Up @@ -6,9 +6,13 @@ API. The merge relates to the number of segments a Lucene index holds within
each shard. The force merge operation allows to reduce the number of segments by
merging them.

This call will block until the merge is complete. If the http connection is
lost, the request will continue in the background, and any new requests will
block until the previous force merge is complete.
=== Blocks during a force merge

Calls to this API block until the merge is complete. If the client
connection is lost before completion then the force merge process
will continue in the background. Any new requests to force merge the
same indices will also block until the ongoing force merge is
complete.

WARNING: Force merge should only be called against *read-only indices*. Running
force merge against a read-write index can cause very large segments to be produced
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