This is a better list of changes from prior stable releases, rather than just the prior beta:https://www.elastic.co/guide/en/elasticsearch/reference/2.0/breakin

This is a better list of changes from prior stable releases, rather than just the prior beta:https://www.elastic.co/guide/en/elasticsearch/reference/2.0/breaking-changes.html https://www.elastic.co/guide/en/elasticsearch/reference/2.0/... Read through the series of pages to understand all major changes.