fix: Fix bug for get segment index state

[xiaocai2333]

issue: #31361
master pr: #31427
2.4 pr: #31428

[czs007]

/approve
/lgtm

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.22%. Comparing base (86e347a) to head (45149bb).

Additional details and impacted files

@@           Coverage Diff           @@
##              2.3   #31429   +/-   ##
=======================================
  Coverage   82.22%   82.22%           
=======================================
  Files         844      844           
  Lines      122292   122291    -1     
=======================================
+ Hits       100550   100552    +2     
+ Misses      18507    18504    -3     
  Partials     3235     3235           

Files	Coverage Δ
internal/datacoord/index_meta.go	98.13% <100.00%> (-0.01%)	⬇️

... and 16 files with indirect coverage changes