Deleting a Global datastore is a two-step process:
See https://paws-r.github.io/docs/elasticache/delete_global_replication_group.html for full documentation.
elasticache_delete_global_replication_group(
GlobalReplicationGroupId,
RetainPrimaryReplicationGroup
)[required] The name of the Global datastore
[required] The primary replication group is retained as a standalone replication group.