code: public Observable<ServiceResponse<Iteration>> updateIterationWithServiceResponseAsync(UUID projectId, UUID iterationId, Iteration updatedIteration) {
          if (projectId == null) {
              throw new IllegalArgumentException("Parameter projectId is required and cannot be null.");
          }
          if (iterationId == null) {
              throw new IllegalArgumentException("Parameter iterationId is required and cannot be null.");
          }
          if (updatedIteration == null) {
              throw new IllegalArgumentException("Parameter updatedIteration is required and cannot be null.");
          }
          if (this.client.apiKey() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiKey() is required and cannot be null.");
          }
          Validator.validate(updatedIteration);
          return service.updateIteration(projectId, iterationId, updatedIteration, this.client.apiKey(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Iteration>>>() {
                  @Override
                  public Observable<ServiceResponse<Iteration>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<Iteration> clientResponse = updateIterationDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Update a specific iteration.
  
  @param projectId Project id
  @param iterationId Iteration id
  @param updatedIteration The updated iteration model
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Iteration object