We've run into an issue where attempting to create new biblios while using ElasticSearch. (Zebra works fine). A bit of troubleshooting finds that it is failing in C4::Biblio in the LinkBibHeadingsToAuthorities function. The logs warn: Exception 'Koha::Exceptions::Elasticsearch::BadResponse' thrown 'Bad response received when submitting request to Elasticsearch' with details => [http://localhost:9200]-[400] [action_request_validation_exception] Validation Failed: 1: type is missing;, type => Request I'm a bit out of my depth here; does anyone have any suggestions? For now, I've headed back to Zebra, but would rather stay with ElasticSearch!
I think your Elasticsearch is too old. That sounds like an error messaging coming from Elasticsearch 6. You need to be on Elasticsearch 7+.
I think you can find more info about it here: https://www.elastic.co/guide/en/elasticsearch/reference/7.17/removal-of-types.html#_what_are_mapping_types