code: public DescribeClusterVersionsResult withClusterVersions(ClusterVersion... clusterVersions) {
          if (this.clusterVersions == null) {
              setClusterVersions(new com.amazonaws.internal.SdkInternalList<ClusterVersion>(clusterVersions.length));
          }
          for (ClusterVersion ele : clusterVersions) {
              this.clusterVersions.add(ele);
          }
          return this;
      }
docs: <p>
  A list of <code>Version</code> elements.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setClusterVersions(java.util.Collection)} or {@link #withClusterVersions(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param clusterVersions
  A list of <code>Version</code> elements.
  @return Returns a reference to this object so that method calls can be chained together.