As you probably already figured out, arent.
As long as I see that filters can be provided at runtime, so to get the full picture, you should ask for a list of available filters at runtime, I can only guess why there is no canonical set of filters that are guaranteed to exist - after all, that introduces such constants is reduced to.
Most (if not all) of the filters that were introduced in 10.4 are still around, so its not too dangerous a bet to rely on them sticking around. However, you should probably always consider a failed search ...
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