docs: public ServiceFuture<ExpressRouteGatewayInner> beginCreateOrUpdateAsync(String resourceGroupName, String expressRouteGatewayName, ExpressRouteGatewayInner putExpressRouteGatewayParameters, final ServiceCallback<ExpressRouteGatewayInner> serviceCallback) {
          return ServiceFuture.fromResponse(beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, expressRouteGatewayName, putExpressRouteGatewayParameters), serviceCallback);
      }