fix: data race when accessing field_ when retrieving

[chyezh]

issue: #39148
pr: #39151

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chyezh
To complete the pull request process, please assign wxyucs after the PR has been reviewed.
You can assign the PR to them by writing /assign @wxyucs in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• internal/core/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[mergify]

@chyezh go-sdk check failed, comment rerun go-sdk can trigger the job again.

[chyezh]

rerun go-sdk

[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 1 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

[mergify]

@chyezh go-sdk check failed, comment rerun go-sdk can trigger the job again.

[chyezh]

rerun go-sdk

[mergify]

@chyezh go-sdk check failed, comment rerun go-sdk can trigger the job again.

[chyezh]

rerun go-sdk