public static <A> GraphTraversal<A, A> has(final GValue<String> label, final String propertyKey, final Object value) {
        return __.<A>start().has(label, propertyKey, value);
    }
@see GraphTraversal#has(GValue, String, Object)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/__.java