Converts a follower index to a regular index.
If the Elasticsearch security features are enabled, you must have
manage_follow_indexindex privileges for the follower index. For more information, see Security privileges.
This API stops the following task associated with a follower index and removes index metadata and settings associated with cross-cluster replication. This enables the index to treated as a regular index. The follower index must be paused and closed before invoking the unfollow API.
Currently cross-cluster replication does not support converting an existing regular index to a follower index. Converting a follower index to a regular index is an irreversible operation.