Concretely, I just searched for "tokens" and missed a hit on "token", which is trivially resolvable with stemming. We can dump Porter or whatever the state of the art is in pretty easily.
D10955 is pursuing proper support for a real index under ElasticSearch, but I don't really want to deal with ElasticSearch on this install or in the Phacility cluster until much later: the cost of adding a new type of service tier is likely far higher than the cost of dropping a stemmer into the indexer.