GlobalReplicationGroupId: [required] The name of the Global datastore
NodeGroupCount: [required] Total number of node groups you want
RegionalConfigurations: Describes the replication group IDs, the Amazon regions where they are stored and the shard configuration for each that comprise the Global datastore
ApplyImmediately: [required] Indicates that the process begins immediately. At present, the only permitted value for this parameter is true.