hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeCoreTest.java [4855:4883]:
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        HugeGraph graph = graph();
        SchemaManager schema = graph.schema();

        schema.edgeLabel("buy")
              .properties("place", "date")
              .link("person", "book")
              .create();
        schema.indexLabel("buyByDate").onE("buy").by("date").range().create();

        Vertex louise = graph.addVertex(T.label, "person", "name", "Louise",
                                        "city", "Beijing", "age", 21);
        Vertex jeff = graph.addVertex(T.label, "person", "name", "Jeff",
                                      "city", "Beijing", "age", 22);
        Vertex sean = graph.addVertex(T.label, "person", "name", "Sean",
                                      "city", "Beijing", "age", 23);

        Vertex java1 = graph.addVertex(T.label, "book", "name", "java-1");
        Vertex java2 = graph.addVertex(T.label, "book", "name", "java-2");
        Vertex java3 = graph.addVertex(T.label, "book", "name", "java-3");

        String[] dates = new String[]{
            "2012-01-01 00:00:00.000",
            "2013-01-01 00:00:00.000",
            "2014-01-01 00:00:00.000"
        };

        louise.addEdge("buy", java1, "place", "haidian", "date", dates[0]);
        jeff.addEdge("buy", java2, "place", "chaoyang", "date", dates[1]);
        sean.addEdge("buy", java3, "place", "chaoyang", "date", dates[2]);
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hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeCoreTest.java [5010:5038]:
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        HugeGraph graph = graph();
        SchemaManager schema = graph.schema();

        schema.edgeLabel("buy")
              .properties("place", "date")
              .link("person", "book")
              .create();
        schema.indexLabel("buyByDate").onE("buy").by("date").range().create();

        Vertex louise = graph.addVertex(T.label, "person", "name", "Louise",
                                        "city", "Beijing", "age", 21);
        Vertex jeff = graph.addVertex(T.label, "person", "name", "Jeff",
                                      "city", "Beijing", "age", 22);
        Vertex sean = graph.addVertex(T.label, "person", "name", "Sean",
                                      "city", "Beijing", "age", 23);

        Vertex java1 = graph.addVertex(T.label, "book", "name", "java-1");
        Vertex java2 = graph.addVertex(T.label, "book", "name", "java-2");
        Vertex java3 = graph.addVertex(T.label, "book", "name", "java-3");

        String[] dates = new String[]{
            "2012-01-01 00:00:00.000",
            "2013-01-01 00:00:00.000",
            "2014-01-01 00:00:00.000"
        };

        louise.addEdge("buy", java1, "place", "haidian", "date", dates[0]);
        jeff.addEdge("buy", java2, "place", "chaoyang", "date", dates[1]);
        sean.addEdge("buy", java3, "place", "chaoyang", "date", dates[2]);
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