private static TinkerGraph getTinkerGraphWithClassicNumberManager() {
        return TinkerGraph.open(getConfigurationHWithClassicNumberManager());
    }
Generate the graph in {@link #createGratefulDead()} into an existing graph.
tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerFactory.java