@ApiModelProperty(name = ClusterResourceProvider.CLUSTER_NAME)
  public String getClusterName() {
    return clusterName;
  }
@param provisioningState whether the cluster is still initializing or has finished with its deployment requests:
                         either {@code INIT} or {@code INSTALLED}, or {@code null} if not set on the request.
ambari-server/src/main/java/org/apache/ambari/server/controller/ClusterRequest.java