code: public Observable<String> importMethodAsync(UUID appId, LuisApp luisApp, ImportMethodVersionsOptionalParameter importMethodOptionalParameter) {
          return importMethodWithServiceResponseAsync(appId, luisApp, importMethodOptionalParameter).map(new Func1<ServiceResponse<String>, String>() {
              @Override
              public String call(ServiceResponse<String> response) {
                  return response.body();
              }
          });
      }
docs: Imports a new version into a LUIS application.
  
  @param appId The application ID.
  @param luisApp A LUIS application structure.
  @param importMethodOptionalParameter 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 String object