code: public ServiceFuture<Void> deleteFaceAsync(String faceListId, UUID persistedFaceId, final ServiceCallback<Void> serviceCallback) {
          return ServiceFuture.fromResponse(deleteFaceWithServiceResponseAsync(faceListId, persistedFaceId), serviceCallback);
      }
docs: Delete an existing face from a face list (given by a persisitedFaceId and a faceListId). Persisted image related to the face will also be deleted.
  
  @param faceListId Id referencing a particular face list.
  @param persistedFaceId Id referencing a particular persistedFaceId of an existing face.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object