Hi, there has been this really bad performance issue with Elasticsearch in the record merging feature. The bug is <https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=22690>. The fix has been around for a while now and was signed-off at a time but had to go through bunch of changes due to rebase conflicts and is needing now sign-off again. Would anyone be interested in taking a look into this? Joonas