[9.3] Corrects a seemingly simple bug where we pass numCands instead of k (#140839)#140852
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elasticsearchmachine merged 1 commit intoelastic:9.3from Jan 17, 2026
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…lastic#140839) Digging through the long and sordid history of this class, I noticed we previously passed in `null`, which would indicate "dynamic K" which defaulted to the size of the request. However, in an effort to simplify the APIs when we rewrote these paths for rescoring, I switched this to numCands. But, since then @pmpailis actually fixed all the default logic in the `Builder#build(int)` parameter, correctly defaulting `k` and `numCands`. So, we SHOULD be able to pass in `k`. A quick check of our yaml tests and they all passed...let's see what CI says. While this is a bug, it would adjust behavior slightly, so only considering the latest bugfix. I could be convinced to backport everywhere if CI is happy.
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Backports the following commits to 9.3: