Clean IVF_FLAT_NM compatible codes

[cydrain]

issue: #30

[sre-ci-robot]

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[cydrain]

/hold

will merge for Milvus 3.0
need do compatible test with Milvus

[mergify]

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[cydrain]

/kind improvement

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.43%. Comparing base (3c46f4c) to head (f1cebbf).
Report is 273 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #856       +/-   ##
=========================================
+ Coverage      0   74.43%   +74.43%     
=========================================
  Files         0       82       +82     
  Lines         0     6895     +6895     
=========================================
+ Hits          0     5132     +5132     
- Misses        0     1763     +1763     

see 82 files with indirect coverage changes

[alexanderguzhva]

/lgtm

[liliu-z]

/reopen

[sre-ci-robot]

@liliu-z: Reopened this PR.

In response to this:

/reopen

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[alexanderguzhva]

/lgtm

[sre-ci-robot]

New changes are detected. LGTM label has been removed.