code: public Observable<ContainerServiceInner> createOrUpdateAsync(String resourceGroupName, String containerServiceName, ContainerServiceInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, containerServiceName, parameters).map(new Func1<ServiceResponse<ContainerServiceInner>, ContainerServiceInner>() {
              @Override
              public ContainerServiceInner call(ServiceResponse<ContainerServiceInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates a container service.
  Creates or updates a container service with the specified configuration of orchestrator, masters, and agents.
  
  @param resourceGroupName The name of the resource group.
  @param containerServiceName The name of the container service in the specified subscription and resource group.
  @param parameters Parameters supplied to the Create or Update a Container Service operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request