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describe how to apply best_compression (#25706)

* describe how to apply best_compression

* update description
Antonio Matarrese 8 years ago
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      docs/reference/index-modules.asciidoc

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docs/reference/index-modules.asciidoc

@@ -78,6 +78,9 @@ WARNING: Expert only. Checking shards may take a lot of time on large indices.
     compression, but this can be set to +best_compression+
     which uses https://en.wikipedia.org/wiki/DEFLATE[DEFLATE] for a higher
     compression ratio, at the expense of slower stored fields performance.
+    If you are updating the compression type, the new one will be applied
+    after segments are merged. Segment merging can be forced using
+    <<indices-forcemerge,force merge>>.
 
 [[routing-partition-size]] `index.routing_partition_size`::