protected static AbstractTinkerGraph registerTestServices(final AbstractTinkerGraph graph) {
        graph.getServiceRegistry().registerService(new TinkerTextSearchFactory(graph));
        graph.getServiceRegistry().registerService(new TinkerDegreeCentralityFactory(graph));
        return graph;
    }
Get an instance of the underlying AbstractTinkerGraph with the provided configuration.
tinkergraph-gremlin/src/test/java/org/apache/tinkerpop/gremlin/tinkergraph/TinkerWorld.java