code: public void deleteFace(String personGroupId, UUID personId, UUID persistedFaceId) {
          deleteFaceWithServiceResponseAsync(personGroupId, personId, persistedFaceId).toBlocking().single().body();
      }
docs: Delete a face from a person. Relative image for the persisted face will also be deleted.
  
  @param personGroupId Id referencing a particular person group.
  @param personId Id referencing a particular person.
  @param persistedFaceId Id referencing a particular persistedFaceId of an existing face.
  @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