fix: [2.5] Support hybrid search with expression template

[xiaocai2333]

issue: #38616

master pr: #38623

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.03%. Comparing base (b132438) to head (abe2c61).
Report is 4 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #38625      +/-   ##
==========================================
- Coverage   81.05%   81.03%   -0.02%     
==========================================
  Files        1381     1381              
  Lines      195090   195091       +1     
==========================================
- Hits       158137   158101      -36     
- Misses      31386    31418      +32     
- Partials     5567     5572       +5     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.33% <ø> (ø)
Go	83.02% <100.00%> (-0.03%)	⬇️

Files with missing lines	Coverage Δ
internal/proxy/search_util.go	81.57% <100.00%> (+0.05%)	⬆️

... and 33 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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