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