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[8.19] Allow zero for rescore_vector.oversample to indicate by-passing oversample and rescoring (#125599) #127662

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Backport

This will backport the following commits from main to 8.19:

Questions ?

Please refer to the Backport tool documentation

…ample and rescoring (elastic#125599)

This allows a `rescore_vector: {oversample: 0}` to indicate bypassing
oversampling and rescoring.

This is useful for:

 - Updating a quantized mapping to turn off automatic rescoring
 - Bypassing oversampling at query time in an ad-hoc manner if its on by default in the mapping

closes: elastic#125157
(cherry picked from commit 009a86a)
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