code: func (s *LesServer) Stop() {
  	s.chtIndexer.Close()
  	// bloom trie indexer is closed by parent bloombits indexer
  	go func() {
  		<-s.protocolManager.noMorePeers
  	}()
  	s.freeClientPool.stop()
  	s.costTracker.stop()
  	s.protocolManager.Stop()
  }
docs: // Stop stops the LES service