code: public Observable<ServiceResponse<List<Image>>> getImagesByIdsWithServiceResponseAsync(UUID projectId, List<String> imageIds, UUID iterationId) {
          if (projectId == null) {
              throw new IllegalArgumentException("Parameter projectId 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(imageIds);
          String imageIdsConverted = this.client.serializerAdapter().serializeList(imageIds, CollectionFormat.CSV);
          return service.getImagesByIds(projectId, imageIdsConverted, iterationId, this.client.apiKey(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<List<Image>>>>() {
                  @Override
                  public Observable<ServiceResponse<List<Image>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<List<Image>> clientResponse = getImagesByIdsDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Get images by id for a given project iteration.
  This API will return a set of Images for the specified tags and optionally iteration. If no iteration is specified the
  current workspace is used.
  
  @param projectId The project id
  @param imageIds The list of image ids to retrieve. Limited to 256
  @param iterationId The iteration id. Defaults to workspace
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;Image&gt; object