Load collection when all vector fields has index

[xige-16]

issue: #25639

/kind improvement
Signed-off-by: xige-16 xi.ge@zilliz.com

[mergify]

@xige-16 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

Merging #27831 (2790114) into master (babf4e3) will increase coverage by 0.03%.
Report is 68 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #27831      +/-   ##
==========================================
+ Coverage   81.71%   81.74%   +0.03%     
==========================================
  Files         819      819              
  Lines      116062   116065       +3     
==========================================
+ Hits        94845    94883      +38     
+ Misses      18048    18021      -27     
+ Partials     3169     3161       -8     

Files	Coverage Δ
internal/proxy/task.go	85.98% <100.00%> (+0.29%)	⬆️

... and 15 files with indirect coverage changes

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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