AWS SDK for .NET Documentation
PrimaryClusterId Property
AmazonAmazon.ElastiCache.ModelModifyReplicationGroupRequestPrimaryClusterId Did this page help you?   Yes   No    Tell us about it...
If this parameter is specified, ElastiCache will promote each of the nodes in the specified cache cluster to the primary role. The nodes of all other clusters in the replication group will be read replicas.
Declaration Syntax
C#
public string PrimaryClusterId { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)