public String getClusterIdentifier() {
        return this.clusterIdentifier;
    }
<p>
A unique identifier for a cluster whose <code>ClusterDbRevisions</code> you are requesting. This parameter is
case sensitive. All clusters defined for an account are returned by default.
</p>

@return A unique identifier for a cluster whose <code>ClusterDbRevisions</code> you are requesting. This
        parameter is case sensitive. All clusters defined for an account are returned by default.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/DescribeClusterDbRevisionsRequest.java