Fix bug : unicode characters from \u0000 to \u0003 removed from property values indexed using search index

[KirubakaranSP]

Fixed #1638

[javeme]

@KirubakaranSP Thanks for your first contribution! some tiny comments:
we can add "#" in front of the 1638 for automatic linking, like #1638.

[codecov]

Codecov Report

Merging #1659 (1327069) into master (6d7f5cc) will increase coverage by 2.18%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1659      +/-   ##
============================================
+ Coverage     64.76%   66.94%   +2.18%     
- Complexity     6913     7064     +151     
============================================
  Files           421      421              
  Lines         34670    34673       +3     
  Branches       4801     4802       +1     
============================================
+ Hits          22455    23213     +758     
+ Misses         9923     9112     -811     
- Partials       2292     2348      +56     

Impacted Files	Coverage Δ
...du/hugegraph/backend/tx/GraphIndexTransaction.java	84.05% <100.00%> (+0.05%)	⬆️
...du/hugegraph/backend/store/BackendSessionPool.java	80.55% <0.00%> (+2.77%)	⬆️
...baidu/hugegraph/backend/store/mysql/MysqlUtil.java	96.61% <0.00%> (+3.38%)	⬆️
.../baidu/hugegraph/backend/store/BackendSession.java	80.95% <0.00%> (+4.76%)	⬆️
...aidu/hugegraph/backend/store/mysql/MysqlTable.java	81.59% <0.00%> (+5.76%)	⬆️
...u/hugegraph/backend/store/mysql/MysqlSessions.java	68.42% <0.00%> (+10.52%)	⬆️
...idu/hugegraph/backend/store/mysql/MysqlTables.java	89.67% <0.00%> (+13.16%)	⬆️
...aidu/hugegraph/backend/store/mysql/MysqlStore.java	81.72% <0.00%> (+17.76%)	⬆️
...u/hugegraph/backend/store/hbase/HbaseSessions.java	57.87% <0.00%> (+57.87%)	⬆️
...egraph/backend/store/mysql/MysqlStoreProvider.java	100.00% <0.00%> (+66.66%)	⬆️
... and 6 more

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[imbajin]

LGTM