we have released a new version of our Kibana multi-tenancy module which fixes a bug when upgrading Elasticsearch. Due to a version conflict, some dashboards were not accessible anymore after upgrading from one Elasticsearch version to the next. No data is lost, and the bugfix release will correct the versions automatically.
The issue itself is decribed here:
The new version v2 can be found on Maven Central as always, and it is a drop-in replacement for v1.
In order to avoid upgrade problems, please install the new release as soon as possible.
Jochen and the Search Guard team