+1 on this one. I'm running embedded in a grails app, so groovy is already on the classpath. I get a (non-fatal) stack trace when I create the node: script_lang not supported [groovy] when it encounters my .groovy file in the script dir. It used to work just fine on 1.7.x. I tried adding an inline script field using the search builder, but it fails in a similar way, claiming "script_lang not supported [groovy]". Any help would be greatly appreciated.
*** Update: I think the reason why it doesn't work is because groovy as a scripting language has been pulled out into the 'lang-groovy' plugin (see https://github.com/elastic/elasticsearch/pull/13834). This is a problem for embedded nodes because there doesn't seem to be a way to install plugins using the NodeBuilder (see Add plugins from classpath in embedded Elasticsearch client node). I think in the short term 2.1.2 still works as it did before, so I'll be rolling back to that version for now.