Add more test case for reindex

[Hailong-am]

Description

1. add integration test for create new index in reindex flow
2. add more unit test
3. add writing index check for alias

Issues Resolved

[List any issues this PR will resolve]

Check List

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[codecov-commenter]

Codecov Report

Merging #404 (0b77833) into index-operation (8c61ffb) will increase coverage by 0.11%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##           index-operation     #404      +/-   ##
===================================================
+ Coverage            57.57%   57.68%   +0.11%     
===================================================
  Files                  222      222              
  Lines                 7331     7341      +10     
  Branches              1188     1191       +3     
===================================================
+ Hits                  4221     4235      +14     
+ Misses                2810     2807       -3     
+ Partials               300      299       -1     

Impacted Files	Coverage Δ
...public/pages/Reindex/container/Reindex/Reindex.tsx	86.63% <0.00%> (+1.88%)	⬆️
...-dashboards-plugin/public/services/IndexService.ts	70.00% <0.00%> (+5.00%)	⬆️

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