code: public ServiceFuture<PersistedFace> getFaceAsync(String personGroupId, UUID personId, UUID persistedFaceId, final ServiceCallback<PersistedFace> serviceCallback) {
          return ServiceFuture.fromResponse(getFaceWithServiceResponseAsync(personGroupId, personId, persistedFaceId), serviceCallback);
      }
docs: Retrieve information about a persisted face (specified by persistedFaceId, personId and its belonging personGroupId).
  
  @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.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object