fix: data race when accessing field_ when retrieving

[chyezh]

issue: #39148
pr: #39151

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.09%. Comparing base (6b127d4) to head (a72cc70).
Report is 5 commits behind head on 2.5.

Files with missing lines	Patch %	Lines
internal/core/src/segcore/SegmentSealedImpl.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              2.5   #39152       +/-   ##
===========================================
+ Coverage   69.54%   81.09%   +11.54%     
===========================================
  Files         294     1389     +1095     
  Lines       26462   196355   +169893     
===========================================
+ Hits        18403   159230   +140827     
- Misses       8059    31536    +23477     
- Partials        0     5589     +5589     

Components	Coverage Δ
Client	78.26% <ø> (∅)
Core	69.53% <0.00%> (-0.01%)	⬇️
Go	83.06% <ø> (∅)

Files with missing lines	Coverage Δ
internal/core/src/segcore/SegmentSealedImpl.cpp	83.86% <0.00%> (-0.25%)	⬇️

... and 1095 files with indirect coverage changes

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[sre-ci-robot]

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[jaime0815]

/lgtm