Relevance Module Elasticsearch version

I have a question about the relevance module. In the bloomreach documentation I see references to elasticsearch 5. Can anyone confirm that the lastest version, which at the moment is 6.3.2 will also work?

No, no guarantees,
please check requirements at:

Pascal, when v13 comes out (planned for Q4) we will start supporting ES 6. This will be backported to version 12 as well at the same time.