Deprecation on a service: Symfony asks to change service name

I am currently trying for the first time to migrate from Symfony 3.4 to 4.3.

I'm at the stage where I have to remove the depreciation so that I can update the dependencies via composing as the doc says

I have solved all the deprecations except one that I have a little trouble. Here it is:

Relying on service auto-registration for type "AppBundle\Entity\AdaImporterDoc" is deprecated since Symfony 3.4 and won't be supported in 4.0. Create a service named "AppBundle\Entity\AdaImporterDoc" instead.