Node group (shard) configuration options.
Each node group (shard) configuration has the following:
Either the ElastiCache for Redis supplied 4-digit id or a user supplied id for the node group these configuration values apply to.
The Availability Zone where the primary node of this node group (shard) is launched.
The outpost ARN of the primary node.
A list of Availability Zones to be used for the read replicas.
The number of Availability Zones in this list must match the value of
ReplicasPerNodeGroup if not specified.
The number of read replica nodes in this node group (shard).
The outpost ARN of the node replicas.
A string that specifies the keyspace for a particular node group.
Keyspaces range from 0 to 16,383.
The string is in the format