StemmingAlgorithm
How a full-text index reduces tokens to a stem.
It is not a tuning knob for every corpus. Stemming makes "running" match "run", which is what somebody searching prose wants and is wrong for a field of product codes or identifiers, and for a language whose stemmer is aggressive it loses distinctions the reader was relying on. Qdrant's default is no stemming, so this is a decision to opt into rather than one to undo.
Disabled exists because Qdrant 1.19 added it: before that the way to turn stemming off was a magic "none" language, which it now deprecates.