[skip e2e]Improve log (#13705)

Signed-off-by: Nsunby <bingyi.sun@zilliz.com>
Co-authored-by: Nsunby <bingyi.sun@zilliz.com>

internal/datacoord/server.go

@@ -448,7 +448,7 @@ func (s *Server) startDataNodeTtLoop(ctx context.Context) {
 		for {
 			select {
 			case <-ctx.Done():
-				log.Debug("data node tt loop shutdown")
+				log.Debug("DataNode timetick loop shutdown")
 				return
 			default:
 			}