code: @Override
      public java.util.concurrent.Future<ListContainerInstancesResult> listContainerInstancesAsync(
              com.amazonaws.handlers.AsyncHandler<ListContainerInstancesRequest, ListContainerInstancesResult> asyncHandler) {
  
          return listContainerInstancesAsync(new ListContainerInstancesRequest(), asyncHandler);
      }
docs: Simplified method form for invoking the ListContainerInstances operation with an AsyncHandler.
  
  @see #listContainerInstancesAsync(ListContainerInstancesRequest, com.amazonaws.handlers.AsyncHandler)