hugegraph-test/src/main/java/org/apache/hugegraph/core/IndexLabelCoreTest.java [588:614]:
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        super.initPropertyKeys();
        HugeGraph graph = graph();
        SchemaManager schema = graph.schema();
        schema.vertexLabel("person").properties("name", "age", "city")
              .primaryKeys("name").create();
        graph.addVertex(T.label, "person", "name", "Baby",
                        "city", "Hongkong", "age", 3);
        graph.tx().commit();

        schema.indexLabel("personByCity").onV("person").secondary()
              .by("city").create();
        schema.indexLabel("personByAge").onV("person").range()
              .by("age").create();
        Assert.assertThrows(IllegalArgumentException.class, () -> {
            schema.indexLabel("personByAgeSecondary").onV("person").secondary()
                  .by("age").create();
        });

        List<Vertex> vertices;
        vertices = graph.traversal().V().has("age", 3).toList();
        Assert.assertEquals(1, vertices.size());
        vertices = graph.traversal().V().has("city", "Hongkong").toList();
        Assert.assertEquals(1, vertices.size());

        vertices = graph().traversal().V().has("city", "Hongkong")
                          .has("age", 3).toList();
        Assert.assertEquals(1, vertices.size());
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hugegraph-test/src/main/java/org/apache/hugegraph/core/IndexLabelCoreTest.java [634:660]:
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        super.initPropertyKeys();
        HugeGraph graph = graph();
        SchemaManager schema = graph.schema();
        schema.vertexLabel("person").properties("name", "age", "city")
              .primaryKeys("name").create();
        graph.addVertex(T.label, "person", "name", "Baby",
                        "city", "Hongkong", "age", 3);
        graph.tx().commit();

        schema.indexLabel("personByCity").onV("person").secondary()
              .by("city").create();
        schema.indexLabel("personByAge").onV("person").range()
              .by("age").create();
        Assert.assertThrows(IllegalArgumentException.class, () -> {
            schema.indexLabel("personByAgeSecondary").onV("person").secondary()
                  .by("age").create();
        });

        List<Vertex> vertices;
        vertices = graph.traversal().V().has("age", 3).toList();
        Assert.assertEquals(1, vertices.size());
        vertices = graph.traversal().V().has("city", "Hongkong").toList();
        Assert.assertEquals(1, vertices.size());

        vertices = graph().traversal().V().has("city", "Hongkong")
                          .has("age", 3).toList();
        Assert.assertEquals(1, vertices.size());
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