search: add missing comma in struct literal.

Change-Id: Ic58d2d5dde8d96f8ef34354ec8be6c62dfdbf8ee
diff --git a/search/search_test.go b/search/search_test.go
index dd28d14..2644ba4 100644
--- a/search/search_test.go
+++ b/search/search_test.go
@@ -241,9 +241,9 @@
 		Fields: searchFieldsWithLang,
 	}
 	doc := &pb.Document{
-		Field:   protoFields,
-		OrderId: proto.Int32(42),
-		OrderIdSource: pb.Document_SUPPLIED.Enum()
+		Field:         protoFields,
+		OrderId:       proto.Int32(42),
+		OrderIdSource: pb.Document_SUPPLIED.Enum(),
 	}
 	if err := loadDoc(&got, doc, nil); err != nil {
 		t.Fatalf("loadDoc: %v", err)