True, the number of replica nodes is decreased immediately.
ApplyImmediately=False is not currently supported.
The number of read replica nodes you want at the completion of this operation. For Redis (cluster mode disabled) replication groups, this is the number of replica nodes in the replication group. For Redis (cluster mode enabled) replication groups, this is the number of replica nodes in each of the replication group's node groups.
The minimum number of replicas in a shard or replication group is:
Redis (cluster mode disabled)
If Multi-AZ is enabled: 1
If Multi-AZ is not enabled: 0
Redis (cluster mode enabled): 0 (though you will not be able to failover to a replica if your primary node fails)
A list of
ConfigureShard objects that can be used to configure each shard
in a Redis (cluster mode enabled) replication group. The
ConfigureShard has three members:
A list of the node ids to remove from the replication group or node group (shard).
The id of the replication group from which you want to remove replica nodes.