just a quick info: We released Search Guard 6.4.0-23.0, compatible with Elasticsearch 6.4.0, along with a matching Kibana Plugin version:
Jochen and the Search Guard team
Search Guard (®) is an Elasticsearch plugin that offers encryption, authentication, and authorization.
Coded with love in Berlin, Denmark, Sweden and the US.
Search Guard is a trademark of floragunn GmbH, registered in the U.S. and in other countries.
Elasticsearch, Kibana, Logstash, and Beats are trademarks of Elasticsearch BV, registered in the U.S. and in other countries.