service: permission: add unlisted tag check for can_search

Author: yashlamba

invenio_vocabularies/services/permissions.py

@@ -17,7 +17,10 @@
 class PermissionPolicy(RecordPermissionPolicy):
     """Permission policy."""
 
-    can_search = [SystemProcess(), AnyUser()]
+    can_search = [
+        SystemProcess(),
+        IfTags(["unlisted"], then_=[SystemProcess()], else_=[AnyUser()]),
+    ]
     can_read = [
         SystemProcess(),
         IfTags(["unlisted"], then_=[SystemProcess()], else_=[AnyUser()]),