gistfile1.java

 public void mergeResults(final Graph original, final Graph computed, final Map<String, String> keyMapping) {
        computed.V().forEach(v1 -> {
            Vertex v2 = original.v(v1.getId());
            keyMapping.forEach((k, v) -> {
                if (v1.getProperty(k).isPresent()) {
                    v2.setProperty(v, v1.getProperty(k).get());
                }
            });
        });
    }