Adding http middle for elastisch calls

[gfrivolt]

Not sure whether there is any support for adding custom middleware for HTTP calls. I've used org.sharetribe/aws-sig4 before to create a middleware adding AWS signature v4 to the requests with elastisch.

Is there some support implemented for that already? Thank you?

[MichaelDrogalis]

@gfrivolt Hi, there's not at the moment. This plugin has been user contributed, and none of the core maintainers are terribly familiar with ES. We'd be happy to take a PR for it though!

[gfrivolt]

Ok, I take a look, I've used AWS sig4 with elastisch, it would be easy to use it inside of a function without onyx-elasticsearch. If it's simple though I'll make a PR.