#multilingual

What do you mean by "post the schema"?
This module creates a config-set zip. using search_api_solr_damin you can "deploy" that zip to a Solr server running in cloud mode and doesn't block the config-set API.

There's obviously a challenge here, but I don't think the proposed solution is the right path.

For starters, \Drupal shouldn't be used in OO code, the relevant services ought to be dependency injected. But directly querying the database to check for duplicate couples the storage class tightly to the database schema. $this->loadByProperties() ought to work for checking for duplicates.

Secondly, hiding the path on translations hides the fact that the translation *does* have an alias. I'd rather skip that part and live with the fact that editing the path on the translation also edits the original language alias.