Contains a security fix for kibana: CVE-2018-3818. https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-6.1.2.html https://www.elastic.co/guide/en/logstash/6.1/logstash-6-1-2.html https://www.elastic.co/guide/en/kibana/6.1/release-notes-6.1.2.html https://www.elastic.co/guide/en/beats/libbeat/6.1/release-notes-6.1.2.html
This change is backwards compatible since the ELK tools at version 5.x remain unchanged. The test suite now both tests ELK-5 and ELK-6.