enhance: make estimate json stats size more accurate

[zhagnlu]

pr: #45875

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[sre-ci-robot]

[INFO] PR Label Summary by Default
[FAILED] PR #45875 not merged

• Title: enhance: make estimate json stats size more accurate
• Status: OPEN
• Link: enhance: make estimate json stats size more accurate #45875

[WARNING] Milestone not set

• PR: enhance: make estimate json stats size more accurate #45876
• Title: enhance: make estimate json stats size more accurate
  Please set a milestone for better release tracking

You can set milestone by commenting:
/set-milestone
Example:
/set-milestone 2.5.0

Use /refresh-label to update related check and label manually

[mergify]

@zhagnlu cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

❌ Patch coverage is 36.36364% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.60%. Comparing base (cb08db0) to head (5a7dc0b).
⚠️ Report is 294 commits behind head on 2.6.

Files with missing lines	Patch %	Lines
internal/datanode/index/task_stats.go	0.00%	10 Missing ⚠️
internal/querynodev2/segments/segment_loader.go	47.05%	8 Missing and 1 partial ⚠️
internal/util/indexcgowrapper/index.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.6   #45876      +/-   ##
==========================================
- Coverage   76.99%   76.60%   -0.40%     
==========================================
  Files        1700     1856     +156     
  Lines      262533   287855   +25322     
==========================================
+ Hits       202142   220502   +18360     
- Misses      53550    60000    +6450     
- Partials     6841     7353     +512     

Components	Coverage Δ
Client	78.03% <65.76%> (-0.11%)	⬇️
Core	83.66% <79.24%> (+1.45%)	⬆️
Go	74.61% <52.20%> (-0.78%)	⬇️

Files with missing lines	Coverage Δ
pkg/util/paramtable/component_param.go	97.61% <100.00%> (-0.13%)	⬇️
internal/querynodev2/segments/segment_loader.go	59.52% <47.05%> (-2.62%)	⬇️
internal/util/indexcgowrapper/index.go	56.83% <0.00%> (-0.90%)	⬇️
internal/datanode/index/task_stats.go	52.69% <0.00%> (-0.78%)	⬇️

... and 655 files with indirect coverage changes

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[sre-ci-robot]

[INFO] PR Label Summary by Default
[FAILED] PR #45875 not merged

• Title: enhance: make estimate json stats size more accurate
• Status: OPEN
• Link: enhance: make estimate json stats size more accurate #45875

[WARNING] Milestone not set

• PR: enhance: make estimate json stats size more accurate #45876
• Title: enhance: make estimate json stats size more accurate
  Please set a milestone for better release tracking

You can set milestone by commenting:
/set-milestone
Example:
/set-milestone 2.5.0

Use /refresh-label to update related check and label manually