Document.related_model has a dangerous use case

[timo-piirmann]

As an example I'm using the official documentation linked here: https://django-elasticsearch-dsl.readthedocs.io/en/latest/fields.html?highlight=related_model#handle-relationship-with-nestedfield-objectfield

There's a CarDocument which has Manufacturer and Ad listed in related_models.

If anyone updated Manufacturer, the related Car instances are re-indexed to ES. If anyone saves an Ad then the related Car instance is also re-indexed to ES. So far so good.

But if anyone DELETE-s and Ad then related Car document in ES gets removed. And this in my case is not obvious or preferred. I think that what should happen is just a re-index of Car document.

OR maybe at least an explicit warning in the documentations on what happends during related model delete

[safwanrahman]

@timo-piirmann Good observation! I have never thought about it! Thanks a lot. This need to be fixed with priority