Hi Mathias,
Currently, the sets are not supported by this feature. We have to check whether Elasticsearch supports this and how. So you have to send us a change request.
May be I can answer you at the end of next week.
But our developers have a first question to this topic: How should the scoring work? Only for one value of the set, and if more the one, should they again be scored? Please, can you ask your customer about is expectations?
Best Regards,
Martin