chore: fix GraphOfTheMoviesExample exception

[simon824]

This pr will fix these exception:

Exception in thread "main" java.lang.IllegalArgumentException: No need to build index on properties [name], because they contains all primary keys [name] for vertex label 'person'

Exception in thread "main" java.lang.IllegalStateException: Stop the current transaction before opening another

[codecov]

Codecov Report

Merging #1953 (c2eec19) into master (5172f77) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1953      +/-   ##
============================================
- Coverage     70.48%   70.47%   -0.02%     
+ Complexity      978      976       -2     
============================================
  Files           452      452              
  Lines         38990    38990              
  Branches       5554     5554              
============================================
- Hits          27482    27477       -5     
- Misses         8809     8814       +5     
  Partials       2699     2699              

Impacted Files	Coverage Δ
...va/com/baidu/hugegraph/util/collection/IntSet.java	73.72% <0.00%> (-1.28%)	⬇️
.../baidu/hugegraph/security/HugeSecurityManager.java	76.88% <0.00%> (-1.01%)	⬇️
...a/com/baidu/hugegraph/backend/query/Condition.java	78.74% <0.00%> (-0.35%)	⬇️
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	79.93% <0.00%> (-0.21%)	⬇️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	83.66% <0.00%> (-0.11%)	⬇️
...om/baidu/hugegraph/backend/store/BackendTable.java	85.11% <0.00%> (+0.59%)	⬆️
...aidu/hugegraph/backend/store/hbase/HbaseTable.java	76.96% <0.00%> (+0.60%)	⬆️
...in/java/com/baidu/hugegraph/schema/IndexLabel.java	77.27% <0.00%> (+1.13%)	⬆️
...hugegraph/backend/store/raft/rpc/RpcForwarder.java	71.18% <0.00%> (+1.69%)	⬆️

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[imbajin]

THX, could add & run it in test/CI?