diff --git a/internal/distributed/indexcoord/service.go b/internal/distributed/indexcoord/service.go
index 1edeae3a78..290e46aaf9 100644
--- a/internal/distributed/indexcoord/service.go
+++ b/internal/distributed/indexcoord/service.go
@@ -126,6 +126,7 @@ func (s *Server) Stop() error {
 
 	s.loopCancel()
 	if s.grpcServer != nil {
+		log.Debug("Graceful stop grpc server...")
 		s.grpcServer.GracefulStop()
 	}