docs: public JobFlowInstancesConfig withInstanceFleets(InstanceFleetConfig... instanceFleets) {
          if (this.instanceFleets == null) {
              setInstanceFleets(new com.amazonaws.internal.SdkInternalList<InstanceFleetConfig>(instanceFleets.length));
          }
          for (InstanceFleetConfig ele : instanceFleets) {
              this.instanceFleets.add(ele);
          }
          return this;
      }