migration_suffix

If the destination index is set to MIGRATION, Curator will reindex all selected indices one by one until they have all been reindexed. By configuring migration_suffix, a value can be appended to each of those index names. For example, if I were reindexing index1, index2, and index3, and migration_suffix were set to -new, then the reindexed indices would be named index1-new, index2-new, and index3-new:

actions:
  1:
    description: >-
      Reindex index1, index2, and index3 with a suffix of -new, resulting in
      indices named index1-new, index2-new, and index3-new
    action: reindex
    options:
      wait_interval: 9
      max_wait: -1
      migration_suffix: -new
      request_body:
        source:
          index: ["index1", "index2", "index3"]
        dest:
          index: MIGRATION
    filters:
    - filtertype: none

migration_suffix can be used in conjunction with migration_prefix