Construction and execution of both query builder and eloquent

How to understand how the construction and execution of both query builder and eloquent works?

I am making a package so that elastic search behaves like a sql DB and that the eloquent and query builder utility is not lost.

I tried to base myself on the jenssegers/laravel-mongodb package but the truth reached a point where I got lost because I can't find how it ends up building the queries and extending the functionality of query builder and eloquent

I really appreciate your help. If you have any documentation that I can study to continue advancing with this driver that I am making, it will be of great help.

I leave the link of the project.

jenssegers/laravel-mongodb

https://github.com/jenssegers/laravel-mongodb

this my package

https://github.com/jorgeortegaceja/elastic-laravel