logstash-plugins/logstash-input-elasticsearch — pull request #6 by ph (2014-12-02 18:02:21+00:00)
Title: Feature/allow the use of metadata

- Allow to store Elasticsearch document information in the `@metadata` field or somewhere else.
- Allow the user to specify which fields to move, the default is _index, _type, _id

I took this https://github.com/elasticsearch/logstash/pull/1644 as the original starting point