remove scale index when update task status

[zhoney]

fixed: #718

Change-Id: I3d7db64d8d404245d5909d836399012921f362a7

[codecov]

Codecov Report

Merging #719 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #719      +/-   ##
============================================
+ Coverage     74.41%   74.45%   +0.04%     
+ Complexity     4143     4142       -1     
============================================
  Files           221      221              
  Lines         18091    18092       +1     
  Branches       2591     2591              
============================================
+ Hits          13462    13471       +9     
+ Misses         3253     3243      -10     
- Partials       1376     1378       +2

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/baidu/hugegraph/task/TaskScheduler.java	57.43% <100%> (+3.91%)	27 <0> (ø)	⬇️
...a/com/baidu/hugegraph/backend/query/Condition.java	77.17% <0%> (-0.42%)	31% <0%> (ø)

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