Elasticsearch

This is a repo achieves three things -

• A preconfigured elasticsearch.yml

  In this config file we disable nmap as Elasticsearch requires vm.max_map_count to be set to 262144 when the default is 65530.

  This is needed because changing vm.max_map_count Would not be possible on most cloud hosted providers.

• Chmod's the /esdata directory with the elasticsearch user.

  The volumes are mounted as root but elasticsearch is ran as non-root.

  This is needed because elasticsearch needs to write to the volume.

• Add an anonymous user that is able to perform a healthcheck to make sure the service is running

Version upgrades

Before upgrading, please carefully read the upgrade manual here: https://www.elastic.co/docs/deploy-manage/upgrade/deployment-or-cluster/upgrade-717