fix: [2.5] enable to build index with single segment

[SpadeA-Tang]

issue: #39232
cherry-pick #39233

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 81.05%. Comparing base (2439278) to head (d2891fc).
Report is 6 commits behind head on 2.5.

Files with missing lines	Patch %	Lines
internal/core/src/index/InvertedIndexTantivy.cpp	67.92%	17 Missing ⚠️
internal/core/src/indexbuilder/index_c.cpp	0.00%	3 Missing ⚠️
internal/core/src/index/VectorIndex.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #39272      +/-   ##
==========================================
+ Coverage   81.02%   81.05%   +0.02%     
==========================================
  Files        1400     1401       +1     
  Lines      197477   197195     -282     
==========================================
- Hits       160013   159829     -184     
+ Misses      31840    31758      -82     
+ Partials     5624     5608      -16     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.43% <75.00%> (-0.23%)	⬇️
Go	83.03% <ø> (+0.03%)	⬆️

Files with missing lines	Coverage Δ
internal/core/src/index/Index.h	100.00% <ø> (ø)
internal/core/src/index/IndexFactory.cpp	86.30% <100.00%> (-3.85%)	⬇️
internal/core/src/index/IndexFactory.h	100.00% <ø> (ø)
internal/core/src/index/InvertedIndexTantivy.h	53.84% <ø> (+3.84%)	⬆️
internal/core/src/index/ScalarIndex.cpp	96.66% <100.00%> (ø)
internal/core/src/index/ScalarIndex.h	23.25% <ø> (ø)
...ernal/core/src/indexbuilder/ScalarIndexCreator.cpp	100.00% <100.00%> (ø)
internal/core/src/index/VectorIndex.h	58.97% <0.00%> (ø)
internal/core/src/indexbuilder/index_c.cpp	25.19% <0.00%> (-3.34%)	⬇️
internal/core/src/index/InvertedIndexTantivy.cpp	86.97% <67.92%> (-3.61%)	⬇️

... and 41 files with indirect coverage changes

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[czs007]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

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[czs007]

rerun go-sdk