Hi to all, in default ES setup sort by call_number is not working. Inside Koha/SearchEngine/Elasticsearch/QueryBuilder.pm, routine _convert_sort_fields there is this fix convection: call_number => 'local-classification', 'call_number' is the string used in the search abstraction level for index used for sort with call numbers 'local-classification' is the name of the ES index selected for sorting by call numbers I think that the selection of 'local-classification' as standard sort index for call numbers is not a good idea. I think is better to use the ES index 'cn-sort' that is connect with 952$6 [MARC21] and 995$s[Unimarc] and the mysql field items.cn_sort. items.cn_sort is the normalized form of the call number used for sorting. I can write a patch to connect cn-sort with 'call_number' and fix also default setup of admin/searchengine/elasticsearch/mappings.yaml, inserting 'cn-sort' as sortable. What do you think ? Cheers Zeno Tajoli -- Zeno Tajoli System Librarian