Confusion about Mongoid integration

[jspawar]

Looking at the READMEs and the example doesn't make it very clear how exactly the Mongoid integration works. So I have the following few questions to hopefully disambiguate what's going on:

1. What do I configure for the Mongoid client's MongoDB URI? Do I still need to run a separate MongoDB instance and point it at that or do I somehow point it at an Elasticsearch instance?
   • If I do point it at an Elasticsearch instance, say a simple one running on the default 9200 port, do I just point it at like elastic-host:9200?
2. If I have some classes that I don't care to have elastic capabilities but still need to be persisted, is that even possible? If so, how? (i.e. can I just not include the mixin or is there some configuration I need to do)

At the heart of this I guess I'm mostly wondering does using this gem somehow use Elasticsearch as a MongoDB implementation when you use it with Mongoid or is it just supplementary somehow?

Thanks.