fix: fill the metric type field in the LoadMetaInfo object

[SimFG]

• issue: [Bug]: Fail to search when upgrading the server from 2.3.x to 2.4.x #35960

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.61%. Comparing base (ea36d13) to head (8d425ba).
Report is 25 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #35962      +/-   ##
==========================================
- Coverage   81.57%   72.61%   -8.96%     
==========================================
  Files        1265     1265              
  Lines      150790   150469     -321     
==========================================
- Hits       123002   109269   -13733     
- Misses      22896    36332   +13436     
+ Partials     4892     4868      -24     

Files with missing lines	Coverage Δ
internal/core/src/query/SearchOnSealed.cpp	0.00% <ø> (-100.00%)	⬇️
internal/core/src/segcore/ConcurrentVector.h	89.05% <ø> (-8.03%)	⬇️
internal/datanode/compaction/segment_writer.go	80.45% <ø> (ø)

... and 252 files with indirect coverage changes

[xiaofan-luan]

we don't need to set setMetricTypeForMetaInfo for master?

[SimFG]

This error occurs when the querynode delegator of 2.4 sends a request to the querynode worker of 2.3. Considering that the master will be 2.5, which is upgraded from 2.4, to avoid being used by others, no setting is made in the master

[jaime0815]

we don't need to set setMetricTypeForMetaInfo for master?
The only risk is that the search request might fail during the upgrade from 2.3 to 2.5.

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SimFG, xiaofan-luan

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• internal/core/OWNERS [xiaofan-luan]
• internal/datanode/OWNERS [xiaofan-luan]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment