How we upgraded our Elasticsearch cluster to Version 2 without downtime Posted by thefine on Monday March 20, 2017 @03:44AM from the medium.com dept. https://medium.com/@AFainshtein/how-we-upgraded-our-elasticsearch-cluster-to-version-2-without-downtime-c97fc19af3f8 ( 3 comments | 3 points | on HN )