code: public DBCluster withCustomEndpoints(String... customEndpoints) {
          if (this.customEndpoints == null) {
              setCustomEndpoints(new com.amazonaws.internal.SdkInternalList<String>(customEndpoints.length));
          }
          for (String ele : customEndpoints) {
              this.customEndpoints.add(ele);
          }
          return this;
      }
docs: <p>
  Identifies all custom endpoints associated with the cluster.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setCustomEndpoints(java.util.Collection)} or {@link #withCustomEndpoints(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param customEndpoints
  Identifies all custom endpoints associated with the cluster.
  @return Returns a reference to this object so that method calls can be chained together.