Existing elk and OpenDistro

Hi,

Arrived here via SentiNL. Looks like what I am looking for. However I do have some questions. Maybe someone here can help me out?

The primairy feature I need is alerting. I already have an elasticsearch/kibana cluster live, up and running. Is it possible to use this as base for Open Distro or is it difficult to migrate to opendistro? (currently our elk stack is on 6.7)

Thnx

edit: I read I can install independent plugins. Is there documentation on what I need to insall where and how?

edit2: Took part of original question to alert form.