fix(indexer): correct bleve indexer token filters (#38853)

* fix #36228
* fix #37221

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/indexer/code/bleve/bleve_test.go

@@ -0,0 +1,59 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package bleve
+
+import (
+	"testing"
+	"time"
+
+	"gitea.dev/models/db"
+	"gitea.dev/modules/indexer/code/internal"
+	inner_bleve "gitea.dev/modules/indexer/internal/bleve"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBleveIndexerTokenFilter(t *testing.T) {
+	dir := t.TempDir()
+	indexer := NewIndexer(dir)
+	defer indexer.Close()
+
+	_, err := indexer.Init(t.Context())
+	require.NoError(t, err)
+
+	batch := inner_bleve.NewFlushingBatch(indexer.inner.Indexer, maxBatchSize)
+	batch.Index("2", &RepoIndexerData{RepoID: 2, Content: "mDNS.port2=12345", UpdatedAt: time.Now()})
+	batch.Flush()
+
+	testCases := []struct {
+		keyword     string
+		expectedIDs []int64
+	}{
+		{keyword: "12345", expectedIDs: []int64{2}},
+		{keyword: "DNS", expectedIDs: []int64{}},
+		{keyword: "mdns", expectedIDs: []int64{2}},
+		{keyword: "port", expectedIDs: []int64{2}},
+		{keyword: "port2", expectedIDs: []int64{2}},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.keyword, func(t *testing.T) {
+			_, results, _, err := indexer.Search(t.Context(), &internal.SearchOptions{
+				Paginator: &db.ListOptions{Page: 1, PageSize: 1},
+				Keyword:   testCase.keyword,
+			})
+			require.NoError(t, err)
+			assert.ElementsMatch(t, testCase.expectedIDs, searchResultIDs(results))
+		})
+	}
+}
+
+func searchResultIDs(result []*internal.SearchResult) []int64 {
+	ids := make([]int64, 0, len(result))
+	for _, hit := range result {
+		ids = append(ids, hit.RepoID)
+	}
+	return ids
+}