code: public ListStackSetOperationsResult withSummaries(StackSetOperationSummary... summaries) {
          if (this.summaries == null) {
              setSummaries(new com.amazonaws.internal.SdkInternalList<StackSetOperationSummary>(summaries.length));
          }
          for (StackSetOperationSummary ele : summaries) {
              this.summaries.add(ele);
          }
          return this;
      }
docs: <p>
  A list of <code>StackSetOperationSummary</code> structures that contain summary information about operations for
  the specified stack set.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setSummaries(java.util.Collection)} or {@link #withSummaries(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param summaries
  A list of <code>StackSetOperationSummary</code> structures that contain summary information about
  operations for the specified stack set.
  @return Returns a reference to this object so that method calls can be chained together.