[Backport 2.x] Fixing KNNCodecServiceTests as reported in the gh issue:[#1593] #1663
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Backport 5de10fc from #1601
Backporting the change as there were issues in 2.x branch: https://github.com/opensearch-project/k-NN/actions/runs/8884598082/job/24394063544?pr=1661