fix: Direct forward delta exclude l0 segments (#36899)

Related to #36887

Forward delete to L0 segment will return error and mark l0 segment
offline causing delegator unserviceable

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/querynodev2/delegator/delta_forward.go

@@ -283,18 +283,22 @@ func (sd *shardDelegator) forwardStreamingDirect(ctx context.Context, deleteData
 					worker, err := sd.workerManager.GetWorker(ctx, entry.NodeID)
 					if err != nil {
 						log.Warn("failed to get worker",
-							zap.Int64("nodeID", paramtable.GetNodeID()),
+							zap.Int64("nodeID", entry.NodeID),
 							zap.Error(err),
 						)
 						// skip if node down
 						// delete will be processed after loaded again
 						continue
 					}
+					// forward to non level0 segment only
+					segments := lo.Filter(entry.Segments, func(segmentEntry SegmentEntry, _ int) bool {
+						return segmentEntry.Level != datapb.SegmentLevel_L0
+					})
 
 					eg.Go(func() error {
 						offlineSegments.Upsert(sd.applyDelete(ctx, entry.NodeID, worker, func(segmentID int64) (DeleteData, bool) {
 							return deleteData, true
-						}, entry.Segments, querypb.DataScope_Historical)...)
+						}, segments, querypb.DataScope_Historical)...)
 						return nil
 					})
 				}