fix: [2.5] empty analyzer params not use standard tokenizer

[aoiasd]

relate: #35853
pr: #38148

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.04%. Comparing base (fcbed3a) to head (6726134).

Additional details and impacted files

@@             Coverage Diff             @@
##              2.5   #38149       +/-   ##
===========================================
+ Coverage   68.87%   81.04%   +12.16%     
===========================================
  Files         289     1360     +1071     
  Lines       25481   190679   +165198     
===========================================
+ Hits        17551   154539   +136988     
- Misses       7930    30649    +22719     
- Partials        0     5491     +5491     

Components	Coverage Δ
Client	72.16% <ø> (∅)
Core	68.87% <ø> (ø)
Go	83.21% <100.00%> (∅)

Files with missing lines	Coverage Δ
internal/util/function/bm25_function.go	80.58% <100.00%> (ø)

... and 1070 files with indirect coverage changes