code: func (fs *Filters) Uninstall(id string) bool {
  	fs.mutex.Lock()
  	defer fs.mutex.Unlock()
  	if fs.watchers[id] != nil {
  		fs.removeFromTopicMatchers(fs.watchers[id])
  		delete(fs.watchers, id)
  		return true
  	}
  	return false
  }
docs: // Uninstall will remove a filter whose id has been specified from
  // the filter collection