[views] backport fix from elasticsearch-dsl

views.py

@@ -66,8 +66,8 @@
         """
         Add custom highlighting
         """
-        return search.highlight(*self.fields) \
-                     .highlight_options(pre_tags="",
+        search = search.highlight(*(f if '^' not in f else f.split('^', 1)[0] for f in self.fields))
+        return search.highlight_options(pre_tags="",
                                         post_tags="",
                                         fragment_size=150)