Ensure cross_fields always uses valid term statistics (#90278) #90316
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In elastic#89016 we adjusted the `cross_fields` scoring formula to prevent negative scores. This fix accidentally dropped another important fix that was added in document frequency (`actualDf`) and the minimum total term frequency (`minTTF`). Otherwise, we can produce invalid term statistics where the total term frequency is less than the document frequency. Fixes elastic#90275
jtibshirani
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In #89016 we adjusted the
cross_fieldsscoring formula to prevent negativescores. This fix accidentally dropped another important fix that was added in
#41938. Specifically, we need to make sure to take the minimum between the
document frequency (
actualDf) and the minimum total term frequency(
minTTF). Otherwise, we can produce invalid term statistics where the totalterm frequency is less than the document frequency.
Backport of #90314