Changes the list of users that belong to the user group.
See https://paws-r.github.io/docs/elasticache/modify_user_group.html for full documentation.
elasticache_modify_user_group(
UserGroupId,
UserIdsToAdd = NULL,
UserIdsToRemove = NULL
)[required] The ID of the user group.
The list of user IDs to add to the user group.
The list of user IDs to remove from the user group.