How well do any of these alternatives work for doing an automatic "More like this" list? I implemented this in Elasticsearch for a client (although it's been so

How well do any of these alternatives work for doing an automatic "More like this" list? I implemented this in Elasticsearch for a client (although it's been so long that I don't recall the specifics of how it works) and as much as I'd like to move away from Java stuff if possible, it'd be a non-starter if I can't replicate that in the new system.