Bug 26487: Add all MARC flavours for not-onloan-count search field

In admin/searchengine/elasticsearch/mappings.yaml the search field not-onloan-count is defined for MARC21 on 999x.
This should be for all the MARC flavours, like in Zebra config.

Test plan:
1) On a UNIMARC database
2) Reset Elasticsearch mappings
3) Check search engine config to see field 'not-onloan-count' on 999$x
4) Same on a NORMARC database

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

admin/searchengine/elasticsearch/mappings.yaml

@@ -2968,6 +2968,16 @@ biblios:
         marc_type: marc21
         sort: ~
         suggestible: ''
+      - facet: ''
+        marc_field: 999x
+        marc_type: unimarc
+        sort: ~
+        suggestible: ''
+      - facet: ''
+        marc_field: 999x
+        marc_type: normarc
+        sort: ~
+        suggestible: ''
     type: ''
   note:
     label: note