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Hi,  for AWS elastic cache, especially cache instance, how do we add more replica? I am looking at the example <https://www.pulumi.com/registry/packages/aws/api-docs/elasticache/cluster/|here>
and it says NumCacheNodes should always be `1`

For working with Redis (Cluster Mode Enabled) replication groups, see the `aws.elasticache.ReplicationGroup` resource.

my case is Redis (Cluster Mode Disabled) since we have to support few instances

although <https://www.pulumi.com/registry/packages/aws/api-docs/elasticache/replicationgroup/#redis-cluster-mode-disabled>