docs: public UpdateContainerInstancesStateResult withContainerInstances(ContainerInstance... containerInstances) {
          if (this.containerInstances == null) {
              setContainerInstances(new com.amazonaws.internal.SdkInternalList<ContainerInstance>(containerInstances.length));
          }
          for (ContainerInstance ele : containerInstances) {
              this.containerInstances.add(ele);
          }
          return this;
      }