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This PR adds support for Elasticsearch 6.x!!! This has been long overdue (Elasticsearch 6.0.0 came out in 7 months ago)...sorry for the delay.
The most relevant change (for this package) in ES 6.x was the strict enforcement of content type on HTTP requests. TL;DR previously ES just figured it out automagically for you, which made debugging kind of hard and was also a security risk. ES6 is now more verbose and will break more often when you don't tell the service what content-type is being exchanged in requests.
For more, see this blog post from Elastic's engineering team on the issue: https://www.elastic.co/blog/strict-content-type-checking-for-elasticsearch-rest-requests.
addresses #43