diff --git a/internal/datanode/flow_graph_delete_node.go b/internal/datanode/flow_graph_delete_node.go
index 89451b7092..93105b1fb2 100644
--- a/internal/datanode/flow_graph_delete_node.go
+++ b/internal/datanode/flow_graph_delete_node.go
@@ -75,7 +75,7 @@ func (dn *deleteNode) Operate(in []Msg) []Msg {
 	}
 
 	if len(in) != 1 {
-		log.Error("Invalid operate message input in deleteNode", zap.Int("input length", len(in)))
+		log.Warn("Invalid operate message input in deleteNode", zap.Int("input length", len(in)))
 		return []Msg{}
 	}
 
diff --git a/internal/indexcoord/index_coord.go b/internal/indexcoord/index_coord.go
index 4d60771006..fd430c3910 100644
--- a/internal/indexcoord/index_coord.go
+++ b/internal/indexcoord/index_coord.go
@@ -991,7 +991,7 @@ func (i *IndexCoord) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsReq
 		if err == nil && ret != nil {
 			return ret, nil
 		}
-		log.Error("failed to get system info metrics from cache, recompute instead",
+		log.Warn("failed to get system info metrics from cache, recompute instead",
 			zap.Error(err))
 
 		metrics, err := getSystemInfoMetrics(ctx, req, i)
diff --git a/internal/querynode/shard_cluster.go b/internal/querynode/shard_cluster.go
index 3d7ba83ad1..de5fa502ee 100644
--- a/internal/querynode/shard_cluster.go
+++ b/internal/querynode/shard_cluster.go
@@ -987,7 +987,7 @@ func (sc *ShardCluster) Search(ctx context.Context, req *querypb.SearchRequest,
 
 	wg.Wait()
 	if err != nil {
-		log.Error("failed to do search",
+		log.Warn("failed to do search",
 			zap.Int64("sourceID", req.GetReq().GetBase().GetSourceID()),
 			zap.Strings("channels", req.GetDmlChannels()),
 			zap.Int64s("segmentIDs", req.GetSegmentIDs()),