diff --git a/.github/workflows/cover.yml b/.github/workflows/cover.yml
index e1a845d..2beeefa 100644
--- a/.github/workflows/cover.yml
+++ b/.github/workflows/cover.yml
@@ -9,9 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Go
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.20.x'
+          go-version: '1.23.x'
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Test
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e0c425b..e2cdef8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Install Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
diff --git a/vector.go b/vector.go
index 9de303c..4c16d10 100644
--- a/vector.go
+++ b/vector.go
@@ -37,9 +37,11 @@ type eligibleDocumentSelector struct {
 	docNums []uint64
 }
 
-func (eds *eligibleDocumentSelector) SegmentEligibleDocs(segmentID int) []uint64 {
+func (eds *eligibleDocumentSelector) SegmentEligibleDocuments(segmentID int) index.EligibleDocumentList {
 	// segmentID not applicable for single doc index
-	return eds.docNums
+	return &eligibleDocumentList{
+		docNums: eds.docNums,
+	}
 }
 
 func (eds *eligibleDocumentSelector) AddEligibleDocumentMatch(id index.IndexInternalID) error {
@@ -50,6 +52,34 @@ func (eds *eligibleDocumentSelector) AddEligibleDocumentMatch(id index.IndexInte
 	return nil
 }
 
+type eligibleDocumentList struct {
+	docNums []uint64
+}
+
+func (edl *eligibleDocumentList) Count() uint64 {
+	return uint64(len(edl.docNums))
+}
+
+func (edl *eligibleDocumentList) Iterator() index.EligibleDocumentIterator {
+	return &eligibleDocumentIterator{
+		docNums: edl.docNums,
+	}
+}
+
+type eligibleDocumentIterator struct {
+	docNums []uint64
+	idx     int
+}
+
+func (edi *eligibleDocumentIterator) Next() (uint64, bool) {
+	if edi.idx >= len(edi.docNums) {
+		return 0, false
+	}
+	rv := edi.docNums[edi.idx]
+	edi.idx++
+	return rv, true
+}
+
 func (r *Reader) NewEligibleDocumentSelector() index.EligibleDocumentSelector {
 	return &eligibleDocumentSelector{}
 }
@@ -57,7 +87,7 @@ func (r *Reader) NewEligibleDocumentSelector() index.EligibleDocumentSelector {
 func (r *Reader) VectorReader(ctx context.Context, vector []float32,
 	field string, k int64, searchParams json.RawMessage,
 	selector index.EligibleDocumentSelector) (index.VectorReader, error) {
-	if selector != nil && len(selector.SegmentEligibleDocs(0)) == 0 {
+	if selector != nil && selector.SegmentEligibleDocuments(0).Count() == 0 {
 		// if selector/filter is applicable but no eligible docs,
 		// then current document does not qualify
 		return NewVectorFieldReaderEmpty(), nil