docs: public Observable<ServiceResponse<Person>> createWithServiceResponseAsync(String personGroupId, String name, String userData) {
          if (this.client.azureRegion() == null) {
              throw new IllegalArgumentException("Parameter this.client.azureRegion() is required and cannot be null.");
          }
          if (personGroupId == null) {
              throw new IllegalArgumentException("Parameter personGroupId is required and cannot be null.");
          }
          NameAndUserDataContract bodyParameter = new NameAndUserDataContract();
          bodyParameter.withName(name);
          bodyParameter.withUserData(userData);
          String parameterizedHost = Joiner.on(", ").join("{AzureRegion}", this.client.azureRegion());
          return service.create(personGroupId, this.client.acceptLanguage(), bodyParameter, parameterizedHost, this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Person>>>() {
                  @Override
                  public Observable<ServiceResponse<Person>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<Person> clientResponse = createDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }