Question: I have a content type that has a mix of user-editable fields and auto-populated fields (from an external source). I would like to mark those fields as disabled right when I create them so the user cannot overwrite them. I know there are readonly modules and ways to do this in hook\_form\_alter but I'm curious if I can short circuit having to do this on the fly and just have it disabled by default. Thanks.

Answer: 
The simple bulk action support in Drupal 8 core does not currently support this feature.
The issue about [Port Views Bulk Operations to Drupal 8](https://www.drupal.org/project/views_bulk_operations/issues/1823572) is closed (completed) now.

If somebody has problem with it, try to use /admin/yourpath in views, then you use admin theme and select/deselect all button should work.