UNIMARC Elasticsearch indexing should be updated, taking into account the new IFLA manual (bug https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=39992) and some of the old proposals (mostly obsolete) made in bug https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20424 I will take care of that