diff --git a/admin/searchengine/elasticsearch/mappings.yaml b/admin/searchengine/elasticsearch/mappings.yaml
index 7602d408d2..33f36852eb 100644
--- a/admin/searchengine/elasticsearch/mappings.yaml
+++ b/admin/searchengine/elasticsearch/mappings.yaml
@@ -739,6 +739,15 @@ authorities:
         sort: ~
         suggestible: ''
     type: ''
+  Subject-heading-thesaurus-conventions:
+    label: Subject-heading-thesaurus-conventions
+    mappings:
+      - facet: ''
+        marc_field: 040f
+        marc_type: marc21
+        sort: ~
+        suggestible: ''
+    type: ''
   authtype:
     label: authtype
     mappings: