Bug 18235: (QA follow-up) Restore facet_order for su-geo field in mappings file

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>

admin/searchengine/elasticsearch/mappings.yaml

@@ -3425,6 +3425,7 @@ biblios:
         sort: ~
         suggestible: ''
     type: string
+    facet_order: 4
   subject:
     label: subject
     mappings: