Web API endpoint for truncating collection

[lunyx]

Is your feature request related to a problem? Please describe.
There's currently a Web API endpoint for deleting from a collection, but it requires a list of ids.

Describe the solution you'd like
Either expose a new endpoint for truncating the collection, or make the list of ids optional and truncate if not provided.

Describe alternatives you've considered
Querying the entire list of ids through the query endpoint, then form a new request with all the ids and pass it to the delete collection endpoint.

Additional context
For collections where we just want to reupload all the entire data set, this would be helpful.