code: public java.util.List<String> getInstanceGroupIds() {
          if (instanceGroupIds == null) {
              instanceGroupIds = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return instanceGroupIds;
      }
docs: <p>
  Instance group IDs of the newly created instance groups.
  </p>
  
  @return Instance group IDs of the newly created instance groups.