DeleteCacheCluster
deletes all associated cache nodes, node endpoints and the cache cluster itself. When you receive a successful response from this operation, Amazon ElastiCache immediately begins deleting the cache cluster; you cannot cancel or revert this operation. This operation cannot be used to delete a cache cluster that is the last read replica of a replication group or node group (shard) that has Multi-AZ mode enabled or a cache cluster from a Redis (cluster mode enabled) replication group.
Due to current limitations on Redis (cluster mode disabled), this operation or parameter is not supported on Redis (cluster mode enabled) replication groups.