The _design document is the only CouchDB document type that can contain a literal slash in the name because, slashes are automatically escaped with urlencoding. Keep scrolling for examples,
Database: mine Document-Name: _design/ec2-instance http://localhost:5984/mine/_design/ec2-instance
No no no!
Database: mine Document-Name: users/ec2-instance http://localhost:5984/mine/users%2Fec2-instance
Database: mine Document-Name: users\/ec2-instance http://localhost:5984/mine/users/ec2-instance