Eve doesn't have any counting methods on `current_app.data`, so there is
no one-to-one translation for `cursor.count()` in
`file_storage/__init__.py`. Since the call was only used in a debug log
entry, I just removed it altogether.
I removed `pillar.cli.operations.index_users_rebuild()`, as it was
importing `pillar.api.utils.algolia.algolia_index_user_save` which doesn't
exist any more, so the code was dead anyway.