resolved review comments

tok/hnsw/helper.go

@@ -24,6 +24,7 @@ const (
 	DotProd              = "dotproduct"
 	plError              = "\nerror fetching posting list for data key: "
 	dataError            = "\nerror fetching data for data key: "
+	EmptyHNSWTreeError   = "HNSW tree has no elements"
 	VecKeyword           = "__vector_"
 	visitedVectorsLevel  = "visited_vectors_level_"
 	distanceComputations = "vector_distance_computations"

tok/hnsw/persistent_hnsw.go

@@ -289,10 +289,10 @@ func (ph *persistentHNSW[T]) calculateNewEntryVec(
 	})
 
 	if err != nil {
-		return 0, errors.Wrapf(err, "HNSW tree has no elements")
+		return 0, errors.Wrapf(err, EmptyHNSWTreeError)
 	}
 	if itr == 0 {
-		return itr, errors.New("HNSW tree has no elements")
+		return itr, errors.New(EmptyHNSWTreeError)
 	}
 
 	return itr, nil

worker/task.go

@@ -381,7 +381,7 @@ func (qs *queryState) handleValuePostings(ctx context.Context, args funcArgs) er
 				int(numNeighbors), index.AcceptAll[float32])
 		}
 
-		if err != nil && !strings.Contains(err.Error(), "HNSW tree has no elements: Key not found") {
+		if err != nil && !strings.Contains(err.Error(), hnsw.EmptyHNSWTreeError+": "+badger.ErrKeyNotFound.Error()) {
 			return err
 		}
 		sort.Slice(nnUids, func(i, j int) bool { return nnUids[i] < nnUids[j] })