Add support for Elasticsearch destination to firehose delivery streams

[epetrovich]

Amazon enabled that feature on Apr 19 2016

https://aws.amazon.com/about-aws/whats-new/2016/04/amazon-kinesis-firehose-adds-amazon-elasticsearch-data-ingestion-and-enhanced-monitoring-features/

[catsby]

Thanks for the request!
For anyone taking up the charge, here's the documentation:

• Developer guide: http://docs.aws.amazon.com/firehose/latest/dev/what-is-this-service.html
• API Guilde: http://docs.aws.amazon.com/firehose/latest/APIReference/Welcome.html

[stack72]

This work is now going to be possible thanks to the work by @catsby in this PR #7375

[catsby]

Well, mostly @dminnear 😉

[iceycake]

The code in #7839 should be ready for PR.

[stack72]

Closed via #7839

[ghost]

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