diff --git a/apps/search_indexes/documents/tag_category.py b/apps/search_indexes/documents/tag_category.py
index cd2c8a90..757483bf 100644
--- a/apps/search_indexes/documents/tag_category.py
+++ b/apps/search_indexes/documents/tag_category.py
@@ -39,4 +39,8 @@ class TagCategoryDocument(Document):
         to the updating of a lot of items.
         """
         if isinstance(related_instance, News):
-            return related_instance.tags
\ No newline at end of file
+            tag_categories = []
+            for tag in related_instance.tags.all():
+                if tag.category not in tag_categories:
+                    tag_categories.append(tag.category)
+            return tag_categories
\ No newline at end of file