Migrating existing users of the library images to the Elastic provided
ones during a minor release (5.6) is a big potentially breaking
change.
Extend support for library images through 5.6 as well until 6.0.0 has
been released.
Version 5.5 of the Elastic stack, including Elasticsearch, Kibana and
Logstash has been delayed.
Update documentation clarifying that images will keep receiving
updates until version 5.6.0.
Tianon Gravi