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[docs] add warning for read-write indices in force merge documentation (#28869)

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Mueed Chaudhry 2018-05-09 12:53:55 -04:00 committed by Adrien Grand
parent 4defaa4f2d
commit bf141a3fd1
1 changed files with 5 additions and 0 deletions
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docs/reference/indices/forcemerge.asciidoc
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@ -10,6 +10,11 @@ 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 lost, the request will continue in the background, and any new requests will
block until the previous force merge is complete. block until the previous 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
(>5Gb per segment), and the merge policy will never consider it for merging again until
it mostly consists of deleted docs. This can cause very large segments to remain in the shards.
[source,js] [source,js]
-------------------------------------------------- --------------------------------------------------
POST /twitter/_forcemerge POST /twitter/_forcemerge