Resiliency is the theme of 1.4.0.

The Elasticsearch team has released 1.4.0, and it is now available on Qbox. The release notes are here. The two most significant changes are:

  1. Groovy replaces MVEL as the default scripting language
  2. The circuit breaker feature enables you to abort search requests that require too much memory.

The v 1.3.5 release is about fixing bugs in the 1.3 branch. Those release notes are here.