fix: fix dup index

[dl239]

close #3300

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -3.36 ⚠️

Comparison is base (0d94caf) 78.98% compared to head (8715680) 75.62%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3306      +/-   ##
============================================
- Coverage     78.98%   75.62%   -3.36%     
- Complexity        0      393     +393     
============================================
  Files           513      688     +175     
  Lines        115709   125867   +10158     
  Branches          0     1186    +1186     
============================================
+ Hits          91391    95190    +3799     
- Misses        24318    30440    +6122     
- Partials          0      237     +237     

Impacted Files	Coverage Δ
src/schema/index_test.cc	100.00% <100.00%> (ø)
src/schema/index_util.cc	76.76% <100.00%> (ø)

... and 191 files with indirect coverage changes

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