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Educate about force merges #577

@amotl

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@amotl

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Elasticsearch, CrateDB, and probably others know the concept of "force merges" as quickly explained on CrateDB Cloud » Automation » Actions.

Force merge: Merges segments on eligible partitions to ensure a specified number.

The CrateDB reference documentation also has information about ForceMerge telemetry information.

+-----------------------+---------------------------------------------------------+
| ``ForceMerge``        | Thread pool statistics of the ``force_merge`` thread    |
|                       | pool used when running an ``optimize`` statement.       |
+-----------------------+---------------------------------------------------------+

There was a wish list item:

Add example for force merge.

I am wondering if that knowledge is only applicable for CrateDB Cloud?

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