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slices

This setting is only used by the reindex action.

This setting can speed up reindexing operations by using Sliced Scroll to slice on the \_uid.

actions:
  1:
    description: "Reindex index1,index2,index3 into new_index"
    action: reindex
    options:
      wait_interval: 9
      max_wait: -1
      slices: 3
      request_body:
        source:
          index: ['index1', 'index2', 'index3']
        dest:
          index: new_index
    filters:
    - filtertype: none

Picking the number of slices

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Here are a few recommendations around the number of slices to use:

Don’t use large numbers. 500 creates fairly massive CPU thrash, so Curator will not allow a number larger than this.
It is more efficient from a query performance standpoint to use some multiple of the number of shards in the source index.
Using exactly as many shards as are in the source index is the most efficient from a query performance standpoint.
Indexing performance should scale linearly across available resources with the number of slices.
Whether indexing or query performance dominates that process depends on lots of factors like the documents being reindexed and the cluster doing the reindexing.

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