fix: Skip text index creation when segment is zero after sorting

[xiaocai2333]

issue: #39961

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.79%. Comparing base (7695924) to head (d2eeca1).
Report is 14 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #39962       +/-   ##
===========================================
+ Coverage   69.62%   79.79%   +10.16%     
===========================================
  Files         307     1500     +1193     
  Lines       27467   207392   +179925     
===========================================
+ Hits        19124   165483   +146359     
- Misses       8343    35884    +27541     
- Partials        0     6025     +6025     

Components	Coverage Δ
Client	79.25% <ø> (∅)
Core	69.63% <ø> (+0.01%)	⬆️
Go	81.45% <100.00%> (∅)

Files with missing lines	Coverage Δ
internal/indexnode/task_stats.go	73.23% <100.00%> (ø)

... and 1194 files with indirect coverage changes

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rerun go-sdk

[xiaocai2333]

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