Uniform variable name: vertexes to vertices

[Linary]

Change-Id: I05c0f52438e3ab74360b396d1c3a278d885a5426

[codecov]

Codecov Report

Merging #529 into master will increase coverage by 0.01%.
The diff coverage is 82.5%.

@@             Coverage Diff              @@
##             master     #529      +/-   ##
============================================
+ Coverage     69.93%   69.95%   +0.01%     
- Complexity     3388     3391       +3     
============================================
  Files           216      216              
  Lines         16503    16503              
  Branches       2359     2359              
============================================
+ Hits          11541    11544       +3     
+ Misses         3700     3697       -3     
  Partials       1262     1262

Impacted Files	Coverage Δ	Complexity Δ
...va/com/baidu/hugegraph/structure/HugeFeatures.java	27.38% <ø> (ø)	2 <0> (ø)	⬇️
.../java/com/baidu/hugegraph/backend/query/Query.java	71.66% <ø> (ø)	50 <0> (+1)	⬆️
.../java/com/baidu/hugegraph/util/StringEncoding.java	6.06% <0%> (ø)	3 <0> (ø)	⬇️
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	82.12% <86.84%> (ø)	208 <22> (ø)	⬇️
...a/com/baidu/hugegraph/backend/query/Condition.java	64.02% <0%> (-0.53%)	23% <0%> (ø)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	80% <0%> (+0.15%)	146% <0%> (+1%)	⬆️
...n/java/com/baidu/hugegraph/task/TaskScheduler.java	52.69% <0%> (+1.24%)	27% <0%> (+1%)	⬆️

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