code: public Observable<List<UUID>> addCustomPrebuiltDomainAsync(UUID appId, String versionId, AddCustomPrebuiltDomainModelsOptionalParameter addCustomPrebuiltDomainOptionalParameter) {
          return addCustomPrebuiltDomainWithServiceResponseAsync(appId, versionId, addCustomPrebuiltDomainOptionalParameter).map(new Func1<ServiceResponse<List<UUID>>, List<UUID>>() {
              @Override
              public List<UUID> call(ServiceResponse<List<UUID>> response) {
                  return response.body();
              }
          });
      }
docs: Adds a customizable prebuilt domain along with all of its models to this application.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param addCustomPrebuiltDomainOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;UUID&gt; object