code: public Observable<RouteTableInner> beginUpdateTagsAsync(String resourceGroupName, String routeTableName) {
          return beginUpdateTagsWithServiceResponseAsync(resourceGroupName, routeTableName).map(new Func1<ServiceResponse<RouteTableInner>, RouteTableInner>() {
              @Override
              public RouteTableInner call(ServiceResponse<RouteTableInner> response) {
                  return response.body();
              }
          });
      }
docs: Updates a route table tags.
  
  @param resourceGroupName The name of the resource group.
  @param routeTableName The name of the route table.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the RouteTableInner object