I think what I'm alluding to is this: When I start searching or creating a post, I get a list of similar posts already existing on the site. I don't think that's built in yet.
As mentioned in the other post, I just started on the plugin might need some support. And yes, I'm using elasticsearch.js maintained by ElasticSearch as library to perfom indexing and search.
The original intent of my question is to see if there's support for "similar questions" feature as a user is trying to start a thread, that is, as they are typing in the title of a new thread. It will help a lot in reducing duplicate threads.