This setting is only used by the cluster_routing action.

action: cluster_routing
description: "Apply routing rules to the entire cluster"
  value: ...
  setting: enable
  wait_for_completion: True
  max_wait: 300
  wait_interval: 10

The value of this must be enable at present. It is a placeholder for future expansion.

There is no default value. This setting must be set by the user or an exception will be raised, and execution will halt.