taking always query[0] in tiered topk

[meiravgri]

Describe the changes in the pull request

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Main objects this PR modified

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• [ ] This PR introduces API changes
• [ ] This PR introduces serialization changes

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fccd74b) 95.63% compared to head (6a9c75b) 95.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #405   +/-   ##
=======================================
  Coverage   95.63%   95.63%           
=======================================
  Files          66       66           
  Lines        4173     4173           
=======================================
  Hits         3991     3991           
  Misses        182      182           

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