Can I filter out audit log entries from user @ns_server?

Couchbase Server
1

I’ve enabled auditing on Couchbase 6.0.2.
We are getting lots of entries in the audit log from

“domain”:“memcached”, “user”:"@ns_server"

Is there any way to filter out these entries via “Ignore Filterable Events From These Users”?
I’ve tried adding @ns_server/memcached and @ns_server/couchbase, but it says “Unrecognized user”