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Force Merge: clarify execution and storage requirements #33882

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Merged
merged 4 commits into from
Oct 23, 2018
Merged

Force Merge: clarify execution and storage requirements #33882

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d290284
Multi index operations are executed synchronously.
frederikbosch Sep 20, 2018
026365d
Update remark on sync/async merging multiple indices
frederikbosch Oct 5, 2018
aaec237
clarified sentence
javanna Oct 23, 2018
78d8332
Merge branch 'master' into patch-1
javanna Oct 23, 2018
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6 changes: 5 additions & 1 deletion docs/reference/indices/forcemerge.asciidoc
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Expand Up @@ -55,7 +55,11 @@ POST /kimchy/_forcemerge?only_expunge_deletes=false&max_num_segments=100&flush=t
=== Multi Index

The force merge API can be applied to more than one index with a single call, or
even on `_all` the indices.
even on `_all` the indices. Multi index operations are executed one shard at a
time per node. Force merge makes the storage for the shard being merged
temporarily increase, up to double its size in case `max_num_segments` is set
to `1`, as all segments need to be rewritten into a new one.


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