At least the metadata indexer should be, because currently, it is based on a journal client dedicated to creating one-shot tasks.
This would:
- simplify the stack by removing moving parts (scheduler, storage access db for content indexer...).
- allow better monitoring (as we already have dashboard for journal client)
Additionally, it would be an opportunity to make sure indexation is always retried on error (currently, it isn't; and failing to index one object causes the whole batch to be lost).