diff --git a/ingest.py b/ingest.py
index ec61478..6a2b9b8 100644
--- a/ingest.py
+++ b/ingest.py
@@ -90,6 +90,10 @@ def build_bulk_actions(
                 "transcript_full": transcript_full,
                 "transcript_secondary_full": doc.get("transcript_secondary_full"),
                 "transcript_parts": parts,
+                "internal_references": doc.get("internal_references", []),
+                "internal_references_count": doc.get("internal_references_count", 0),
+                "referenced_by": doc.get("referenced_by", []),
+                "referenced_by_count": doc.get("referenced_by_count", 0),
             },
         }
 
@@ -121,6 +125,10 @@ def ensure_index(client: "Elasticsearch", index: str) -> None:
                         "text": {"type": "text"},
                     },
                 },
+                "internal_references": {"type": "keyword"},
+                "internal_references_count": {"type": "integer"},
+                "referenced_by": {"type": "keyword"},
+                "referenced_by_count": {"type": "integer"},
             }
         },
     )
diff --git a/search_app.py b/search_app.py
index c0ecd39..00f2da1 100644
--- a/search_app.py
+++ b/search_app.py
@@ -400,7 +400,7 @@ def build_query_payload(
         elif sort == "older":
             body["sort"] = [{"date": {"order": "asc"}}]
         elif sort == "referenced":
-            body["sort"] = [{"referenced_by_count": {"order": "desc"}}]
+            body["sort"] = [{"referenced_by_count": {"order": "desc", "unmapped_type": "long"}}]
         return body
 
     if query:
@@ -505,7 +505,7 @@ def build_query_payload(
     elif sort == "older":
         body["sort"] = [{"date": {"order": "asc"}}]
     elif sort == "referenced":
-        body["sort"] = [{"referenced_by_count": {"order": "desc"}}]
+        body["sort"] = [{"referenced_by_count": {"order": "desc", "unmapped_type": "long"}}]
     return body