Heya,
We just released Groovy lang plugin 1.5.0 for Elasticsearch: https://github.com/elasticsearch/elasticsearch-lang-groovy
It mainly adds support of prepareUpdate in groovy client #10
Full list is here: https://github.com/elasticsearch/elasticsearch-lang-groovy/issues?labels=1.5.0&state=closed
Have fun!
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David Pilato | Technical Advocate | Elasticsearch.com
@dadoonet | @elasticsearchfr | @scrutmydocs