Elasticsearch adaptor

The elasticsearch adaptor sends data to defined endpoints. List of supported versions is below.

Version	Note
1.X	This version does not support bulk operations and will thus be much slower.
2.X	Will only receive bug fixes, please consider upgrading.
5.X	Most recent and supported version.

IMPORTANT

If you want to keep the source _id as the elasticsearch document _id, transporter will automatically do this. If you wish to use the auto-generated _id field for elasticsearch but would like to retain the originating _id from the source, you'll need to include a transform function similar to the following (assumes MongoDB source):

module.exports = function(msg) {
   msg.data["mongo_id"] = msg.data._id['$oid']
   msg.data = _.omit(msg.data, ["_id"]);
   return msg;
}

NOTE By using the elasticsearch auto-generated _id, it is not currently possible for transporter to process update/delete operations. Future work is planned in #39 to address this problem.

Configuration:

- es:
  type: elasticsearch
  uri: https://username:password@hostname:port/thisgetsignored
  timeout: 10s # optional, defaults to 30s
  aws_access_key: XXX # optional, used for signing requests to AWS Elasticsearch service
  aws_access_secret: XXX # optional, used for signing requests to AWS Elasticsearch service