Enyime Couchbase - flushing memcached bucket

Question

I'm trying to flush a memcached bucket in Couchbase using the Enyim client library.

using (var client = new MemcachedClient())
        {                                
            client.FlushAll();                
        }

This doesn't work as my next request is still returning data from the cache.

This does work if i explicity call remove as below

using (var client = new MemcachedClient())
        {                
            client.Remove(key);
        }

But I want a way to invalidate all of the items in the bucket as they will be invalidated by an external data load.

NB. Initiating a flush on the bucket from the Couchbase admin web app does have the desired outcome.

Why does it not work in Enyim?