public default GraphTraversal<S, E> identity() {
        this.asAdmin().getGremlinLang().addStep(Symbols.identity);
        return this.asAdmin().addStep(new IdentityStep<>(this.asAdmin()));
    }
Map the <code>E</code> object to itself. In other words, a "no op."

@return the traversal with an appended {@link IdentityStep}.
@since 3.0.0-incubating
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversal.java