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Add documentation about ILM forcemerge with best_compression #51893

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Feb 5, 2020
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Add documentation about ILM forcemerge with best_compression #51893

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13 changes: 9 additions & 4 deletions docs/reference/ilm/policy-definitions.asciidoc
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Expand Up @@ -300,12 +300,17 @@ most a specific number of <<indices-segments,segments>>.
[options="header"]
|======
| Name | Required | Default | Description
| `max_num_segments` | yes | - | The number of
segments to merge to.
To fully merge the
index, set it to `1`
| `max_num_segments` | yes | - | The number of segments to merge to. To fully merge the index, set it to `1`
| `codec` | no | - | Optional specification of the `best_compression` codec
|======

[WARNING]
======
When using the `"codec": "best_compression"` configuration in the ILM forcemerge action, ILM will
<<indices-close,close>> and then <<indices-open-close,re-open>> the index prior to a forcemerge.
During this time the index will be unavailable for either read or write operations.
======

[source,console]
--------------------------------------------------
PUT _ilm/policy/my_policy
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