Fix iterator based range search

[zhengbuqian]

kind/bug issue: #600

/hold

hold for #599 to merge first

[sre-ci-robot]

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[mergify[bot]]

@zhengbuqian 🔍 Important: PR Classification Needed!

For efficient project management and a seamless review process, it's essential to classify your PR correctly. Here's how:

1. If you're fixing a bug, label it as kind/bug.
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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.29%. Comparing base (3c46f4c) to head (b37e4e7). Report is 72 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #601       +/-   ##
=========================================
+ Coverage      0   70.29%   +70.29%     
=========================================
  Files         0       67       +67     
  Lines         0     4719     +4719     
=========================================
+ Hits          0     3317     +3317     
- Misses        0     1402     +1402     

see 67 files with indirect coverage changes

[zhengbuqian]

/unhold

/kind bug

[zhengbuqian]

issue: https://github.com/zilliztech/knowhere/issues/600

[zhengbuqian]

/run-e2e

[cydrain]

/lgtm