Hi! (I did not want to file a bug yet, because maybe we're doing something stupid on our side...) We're using Elasticsearch for searching, but when using a non-default sort, the results are not really sorted: https://katalog.landesbibliothek.steiermark.at/cgi-bin/koha/opac-search.pl?idx=&q=aristophanes&sort_by=author_az This should sort by author, and it seems to be partly sorted, but several results are completly out of place. Here's another example, sorted by publication date: https://katalog.landesbibliothek.steiermark.at/cgi-bin/koha/opac-search.pl?idx=&q=budapest+f%C3%BChrer&sort_by=pubdate_dsc&addto=Add+to... We get the weirdest results when sorting by author: https://libelle.stmk.gv.at/cgi-bin/koha/opac-search.pl?idx=&q=wald&sort_by=author_az&addto=Hinzuf%C3%BCgen+zu... I dumped the query from Koha and sent it directly to Elasticsearch, and found some weird data in the result: curl http://es:9200/index/_search?pretty -X GET -H 'Content-Type: application/json' -d '{"sort":[{"issues__sort":{"order":"asc"}}],"query":{"query_string":{"default_operator":"AND","query":"(arisophanes)","lenient":true,"type":"cross_fields","fields":["title"],"fuzziness":"auto","analyze_wildcard":true}}}' "hits" : { "hits" : [ { "_source" : { .... "sort" : [ "ށA†倀\u0001" ] }, Now I'm not sure if the weird binary data in sort ("ށA†倀\u0001") is some ES-internal representation, or if there's something wrong with our index or our data? Does anybody else has any experience with using the non-default sort methods and elasticsearch? I doubt that this is a bug in Koha, because it's a very obvious and often-used feature, so I fear we might have a problem with some data / ES-Mappings / etc. Any ideas / input? Greetings, domm -- #!/usr/bin/perl https://domm.plix.at for(ref bless{},just'another'perl'hacker){s-:+-$"-g&&print$_.$/}