List of ObjectIDs for an Algolia Index
Browse is the right way to go.
The good thing is that you can specify arguments while performing a browse_all and one of them can be attributesToRetrieve: [] to not retrieve any attributes. You'll therefore only get the objectID.
Is there a way to retrieve all objectIDs from an Algolia Index? 
I know there is [*Index Name*].browse_all() which in the docs say it can retrieve 1000 objects at a time but it retrieves the entire object rather than just the objectIDs.
I can work with pagination but would rather not and do not want to pull the entire object because our indexes are not small.