code: function disableReplication (id, rev, opts0, callback0) {
      const { opts, callback } = getCallback(opts0, callback0)
      const req = {
        db: '_replicator',
        method: 'DELETE',
        path: id,
        qs: Object.assign(opts, { rev: rev })
      }
      return relax(req, callback)
    }
docs: http://guide.couchdb.org/draft/replication.html