Migration plugin expects to migrate only FileContentUnit
Some pulp content do not have files, and they are subclassed from ContentUnit and not FileContentUnit.
These content types does not have `downloaded` attribute, therefore following query fails:
for i, record in enumerate(mongo_content_qs.only('id', '_storage_path', '_last_updated', '_content_type_id', 'downloaded').batch_size(batch_size)):
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