Bleve is just a library that provides this functionality, you first have to build an application that uses Bleve, and deploy that.

Bleve does (optionally) support persistence, so reading/writing files is one place it does directly interact with the environment. The environment must support mmap.

There are several projects which support distributed index/search workloads with Bleve. The exact approaches vary, but they all use Bleve to perform node local operations, and coordinating this is done at a higher level by the application.

I suspect I don't understand the terminology you're using in the last question, as Bleve has no training, models or nodes.