@Override
        public Traversal<Vertex, Integer> get_g_withBulkXfalseX_withSackX1_sumX_V_out_barrier_sack() {
            return g.withBulk(false).withSack(1, sum).V().out().barrier().sack();
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/SackTest.java