Improve datacoord log (#13392)

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

internal/datacoord/services.go

@@ -951,10 +951,10 @@ func (s *Server) GetFlushState(ctx context.Context, req *milvuspb.GetFlushStateR
 	}
 
 	if len(unflushed) != 0 {
-		log.Debug("unflushed segment ids", zap.Int64s("segment ids", unflushed), zap.Int("len", len(unflushed)))
+		log.Debug("[flush state] unflushed segment ids", zap.Int64s("segment ids", unflushed), zap.Int("len", len(unflushed)))
 		resp.Flushed = false
 	} else {
-		log.Debug("all segment is flushed", zap.Int64s("segment ids", req.GetSegmentIDs()))
+		log.Debug("[flush state] all segment is flushed", zap.Int64s("segment ids", req.GetSegmentIDs()))
 		resp.Flushed = true
 	}