improve vertex/edge delete perf

[javeme]

Change-Id: I3e17cd079c1b21f0a45d7ccd90455ee7bdec100b

[codecov]

Codecov Report

Merging #1150 into master will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #1150      +/-   ##
============================================
- Coverage     65.85%   65.85%   -0.01%     
- Complexity     5654     5660       +6     
============================================
  Files           355      355              
  Lines         28848    28871      +23     
  Branches       4053     4056       +3     
============================================
+ Hits          18998    19012      +14     
- Misses         7965     7972       +7     
- Partials       1885     1887       +2     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/auth/HugeGraphAuthProxy.java	4.08% <0.00%> (-0.05%)	0.00 <0.00> (ø)
...e/src/main/java/com/baidu/hugegraph/HugeGraph.java	65.30% <ø> (ø)	9.00 <0.00> (ø)
...n/java/com/baidu/hugegraph/schema/SchemaLabel.java	68.18% <0.00%> (-1.05%)	28.00 <1.00> (+1.00)	⬇️
...in/java/com/baidu/hugegraph/StandardHugeGraph.java	80.76% <88.88%> (+0.36%)	116.00 <4.00> (+4.00)
...in/java/com/baidu/hugegraph/api/graph/EdgeAPI.java	54.21% <100.00%> (-0.24%)	0.00 <0.00> (ø)
.../java/com/baidu/hugegraph/api/graph/VertexAPI.java	35.97% <100.00%> (-0.39%)	0.00 <0.00> (ø)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	81.16% <0.00%> (ø)	202.00% <0.00%> (+1.00%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5a70819...6791e9a. Read the comment docs.