It's also a Django project, I like what you have done. It's a nice lib and it's intuitive. How do you handle a ES document which is a composition of multiple Django Model?

It's just personal opinion but I try to avoid having my application responsible of the data integrity so I went into the way of ES River plugin to pull data. I used the JDBC one, https://github.com/jprante/elasticsearch-river-jdbc ... I met some problems but at the end, it works quite well and don't need logic in the application keep the data synced.

Two other reason that I used River was to not make the app slower by saving data in ES and also of being able to run the application during development without the need of ES and being installed able to substitute the search with a stub.