Documents of inherited classes cannot be converted to arrays

[0x6368]

Right now, it is not possible to convert documents of inherited class, even if one of the parent classes has the @ES\Index annotation.

If this was possible, you could get Doctrine entities from the database and then persist them to Elasticsearch.
The Doctrine entities, you get from a query of a class inherited by the original entity class.

You can read more about proxy objects here.