[Bug] gremlin query response in `hugegraph hubble` is different from document

[DoodleBears]

Bug Type (问题类型)

data inconsistency (数据不一致)

Before submit

• [X] I had searched in the issues and found no similar issues.

Environment (环境信息)

• Server Version: v1.0.0:latest [Docker]
• Hubble Version: v1.6.0:latest [Docker]
• Data Size: 2 vertices, 1 edges

Expected & Actual behavior (期望与实际表现)

As shown in picture below, gremlin query response in hugegraph hubble is different from document gremlin 查询边 which includes inV and outV instead of source and target

{
	"id": "S1:marko>2>>S2:lop",
	"label": "created",
	"type": "edge",
	"inVLabel": "software",
	"outVLabel": "person",
	"inV": "2:lop",
	"outV": "1:marko",
	"properties": {
		"weight": 0.4,
		"date": "20171210"
	}
}

Vertex/Edge example (问题点 / 边数据举例)

No response

Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

No response

[imbajin]

Known issue https://github.com/apache/incubator-hugegraph-doc/issues/260

Would u like to enhance some of them?

[DoodleBears]

Sure.