Pauses a follower index.
This API pauses a follower index. When this API returns, the follower index will not fetch any additional operations from the leader index. You can resume following with the resume follower API. Pausing and resuming a follower index can be used to change the configuration of the following task.
If the Elasticsearch security features are enabled, you must have
privileges on the cluster that contains the follower index. For more information,
see Security privileges.