Is there a way to find the LEAST similar records using Elasticsearch (or "More Unlike This")

Question

I have an index full of submissions from a survey form. For any given record I'm trying to find the other records which are least like the base record. Eventually it might be great to find the records which are not 100% unlike the source record but mostly.

As background, the ultimate goal is that we're trying to pair up survey respondents with people unlike them but not so unlike them that a conversation is impossible.

I had considered simply doing a basic More Like This query and then reverse-sorting the results, although I believe that might still find me records which are more similar than not.

Thanks for any suggestions. If there are non-Elasticsearch solutions that are obvious, that's acceptable as well.