fix: update search fields in BookListView

apps/library/views.py

@@ -89,7 +89,7 @@ class BookListView(ListAPIView):
     serializer_class = BookSerializer
     permission_classes = (IsAuthenticated,)
     filter_backends = [SearchFilter]
-    search_fields = ['title', 'summary', 'author']
+    search_fields = ['title', 'summary', 'publisher', 'isbn']
 
     @book_list_swagger
     def get(self, request, *args, **kwargs):