public String getClusterIdentifier() {
        return this.clusterIdentifier;
    }
<p>
The unique identifier of the cluster for which you want to change the retention period for either automated or
manual snapshots that are copied to a destination Amazon Web Services Region.
</p>
<p>
Constraints: Must be the valid name of an existing cluster that has cross-region snapshot copy enabled.
</p>

@return The unique identifier of the cluster for which you want to change the retention period for either
        automated or manual snapshots that are copied to a destination Amazon Web Services Region.</p>
        <p>
        Constraints: Must be the valid name of an existing cluster that has cross-region snapshot copy enabled.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/ModifySnapshotCopyRetentionPeriodRequest.java