code: public void update(String faceListId, UpdateFaceListsOptionalParameter updateOptionalParameter) {
          updateWithServiceResponseAsync(faceListId, updateOptionalParameter).toBlocking().single().body();
      }
docs: Update information of a face list.
  
  @param faceListId Id referencing a particular face list.
  @param updateOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws APIErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent