number_of_shards

This setting is only used by the shrink action.

action: shrink
description: >-
  Shrink selected indices on the node with the most available space.
  Set the number of shards to 2.
options:
  shrink_node: DETERMINISTIC
  number_of_shards: 2
filters:
  - filtertype: ...

The value of this setting determines the number of primary shards in the target index. The default value is 1.

The value for number_of_shards must meet the following criteria:

It must be lower than the number of primary shards in the source index.
It must be a factor of the number of primary shards in the source index.

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