enhancement(search): implement search match highlighting for the content field

services/search/pkg/opensearch/engine.go

@@ -115,7 +115,15 @@ func (e *Engine) Search(ctx context.Context, sir *searchService.SearchIndexReque
 		)
 	}
 
-	body, err := NewRootQuery(boolQuery).MarshalJSON()
+	body, err := NewRootQuery(boolQuery, RootQueryOptions{
+		Highlight: RootQueryHighlight{
+			PreTags:  []string{"<mark>"},
+			PostTags: []string{"</mark>"},
+			Fields: map[string]RootQueryHighlight{
+				"Content": {},
+			},
+		},
+	}).MarshalJSON()
 	if err != nil {
 		return nil, fmt.Errorf("failed to marshal query: %w", err)
 	}

services/search/pkg/opensearch/engine_convert.go

@@ -58,7 +58,14 @@ func searchHitToSearchMessageMatch(hit opensearchgoAPI.SearchHit) (*searchMessag
 			MimeType: resource.MimeType,
 			Deleted:  resource.Deleted,
 			Tags:     resource.Tags,
-			//Highlights: getFragmentValue(hit.Fragments, "Content", 0),
+			Highlights: func() string {
+				contentHighlights, ok := hit.Highlight["Content"]
+				if !ok {
+					return ""
+				}
+
+				return strings.Join(contentHighlights[:], "; ")
+			}(),
 			Audio: func() *searchMessage.Audio {
 				if !strings.HasPrefix(resource.MimeType, "audio/") {
 					return nil

services/search/pkg/opensearch/os_dsl_query_root.go

@@ -9,8 +9,6 @@ type RootQuery struct {
 	options RootQueryOptions
 }
 
-type RootQueryOptions struct{}
-
 func NewRootQuery(builder Builder, o ...RootQueryOptions) *RootQuery {
 	return &RootQuery{query: builder, options: merge(o...)}
 }
@@ -50,3 +48,13 @@ func (q *RootQuery) String() string {
 	b, _ := q.MarshalJSON()
 	return string(b)
 }
+
+type RootQueryOptions struct {
+	Highlight RootQueryHighlight `json:"highlight,omitempty"`
+}
+
+type RootQueryHighlight struct {
+	PreTags  []string                      `json:"pre_tags,omitempty"`
+	PostTags []string                      `json:"post_tags,omitempty"`
+	Fields   map[string]RootQueryHighlight `json:"fields,omitempty"`
+}

services/search/pkg/opensearch/os_dsl_query_root_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/opencloud-eu/opencloud/services/search/pkg/opensearch/internal/test"
 )
 
-func TestQuery(t *testing.T) {
+func TestRootQuery(t *testing.T) {
 	tests := []opensearchtest.TableTest[opensearch.Builder, map[string]any]{
 		{
 			Name: "simple",
@@ -24,6 +24,37 @@ func TestQuery(t *testing.T) {
 				},
 			},
 		},
+		{
+			Name: "highlight",
+			Got: opensearch.NewRootQuery(
+				opensearch.NewTermQuery[string]("content").Value("content"),
+				opensearch.RootQueryOptions{
+					Highlight: opensearch.RootQueryHighlight{
+						PreTags:  []string{"<b>"},
+						PostTags: []string{"</b>"},
+						Fields: map[string]opensearch.RootQueryHighlight{
+							"content": {},
+						},
+					},
+				},
+			),
+			Want: map[string]any{
+				"query": map[string]any{
+					"term": map[string]any{
+						"content": map[string]any{
+							"value": "content",
+						},
+					},
+				},
+				"highlight": map[string]any{
+					"pre_tags":  []string{"<b>"},
+					"post_tags": []string{"</b>"},
+					"fields": map[string]any{
+						"content": map[string]any{},
+					},
+				},
+			},
+		},
 	}
 
 	for _, test := range tests {