public Observable<Void> updateFaceAsync(String personGroupId, UUID personId, UUID persistedFaceId, UpdateFaceOptionalParameter updateFaceOptionalParameter) {
        return updateFaceWithServiceResponseAsync(personGroupId, personId, persistedFaceId, updateFaceOptionalParameter).map(new Func1<ServiceResponse<Void>, Void>() {
            @Override
            public Void call(ServiceResponse<Void> response) {
                return response.body();
            }
        });
    }
public Observable < Void > updateFaceAsync ( String personGroupId , UUID personId , UUID persistedFaceId , UpdateFaceOptionalParameter updateFaceOptionalParameter ) { return updateFaceWithServiceResponseAsync ( personGroupId , personId , persistedFaceId , updateFaceOptionalParameter ) . map ( new Func1 < ServiceResponse < Void > , Void > ( ) { @ Override public Void call ( ServiceResponse < Void > response ) { return response . body ( ) ; } } ) ; }
Update a person persisted face's userData field.

@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 updateFaceOptionalParameter the object representing the optional parameters to be set before calling this API
@throws IllegalArgumentException thrown if parameters fail the validation
@return the {@link ServiceResponse} object if successful.