@Override
    public Configuration configuration() {
        return configuration;
    }
This method only has an effect if the {@link TinkerGraph#GREMLIN_TINKERGRAPH_GRAPH_LOCATION} is set, in which case the
data in the graph is persisted to that location. This method may be called multiple times and does not release
resources.
tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/AbstractTinkerGraph.java