docs: @Override
      public java.util.concurrent.Future<SwapEnvironmentCNAMEsResult> swapEnvironmentCNAMEsAsync(
              com.amazonaws.handlers.AsyncHandler<SwapEnvironmentCNAMEsRequest, SwapEnvironmentCNAMEsResult> asyncHandler) {
  
          return swapEnvironmentCNAMEsAsync(new SwapEnvironmentCNAMEsRequest(), asyncHandler);
      }