@Override
        public Traversal<Vertex, Collection<Integer>> get_g_V_hasLabelXpersonX_aggregateXxX_byXageX_capXxX_asXyX_selectXyX() {
            return g.V().hasLabel("person").aggregate("x").by("age").cap("x").as("y").select("y");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AggregateTest.java