Fix seq no always -2 bug

[bowenlan-amzn]

Issue #, if available:

Description of changes:

CheckList:

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #924 (5bb8161) into 2.x (53174c4) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x     #924      +/-   ##
============================================
- Coverage     75.97%   75.82%   -0.15%     
+ Complexity     2899     2895       -4     
============================================
  Files           366      366              
  Lines         16643    16643              
  Branches       2413     2413              
============================================
- Hits          12644    12620      -24     
- Misses         2612     2629      +17     
- Partials       1387     1394       +7     

Files Changed	Coverage Δ
...nt/indexstatemanagement/ManagedIndexCoordinator.kt	69.05% <100.00%> (-0.29%)	⬇️
...t/action/indexpolicy/TransportIndexPolicyAction.kt	80.95% <100.00%> (ø)

... and 11 files with indirect coverage changes