extra_settingsedit

This setting should be nested YAML. The values beneath extra_settings will be used by whichever action uses the option.

action: alias
description: "Add/Remove selected indices to or from the specified alias"
options:
  name: alias_name
  extra_settings:
    filter:
      term:
        user: kimchy
add:
  filters:
  - filtertype: ...
remove:
  filters:
  - filtertype: ...
action: create_index
description: "Create index as named"
options:
  name: myindex
  # ...
  extra_settings:
    settings:
      number_of_shards: 1
      number_of_replicas: 0
    mappings:
      type1:
        properties:
          field1:
            type: string
            index: not_analyzed

See the official Elasticsearch Documentation.

actions:
  1:
    action: restore
    description: >-
      Restore all indices in the most recent snapshot with state SUCCESS.  Wait
      for the restore to complete before continuing.  Do not skip the repository
      filesystem access check.  Use the other options to define the index/shard
      settings for the restore.
    options:
      repository:
      # If name is blank, the most recent snapshot by age will be selected
      name:
      # If indices is blank, all indices in the snapshot will be restored
      indices:
      extra_settings:
        index_settings:
          number_of_replicas: 0
      wait_for_completion: True
      max_wait: 3600
      wait_interval: 10
    filters:
    - filtertype: state
      state: SUCCESS
      exclude:
    - filtertype: ...
action: rollover
description: >-
  Rollover the index associated with index 'name', which should be in the
  form of prefix-000001 (or similar), or prefix-YYYY.MM.DD-1.
options:
  name: aliasname
  conditions:
    max_age: 1d
    max_docs: 1000000
  extra_settings:
    index.number_of_shards: 3
    index.number_of_replicas: 1
  timeout_override:
  continue_if_exception: False
  disable_action: False

There is no default value.