How to solve this "Content type detection for rest requests is deprecated" issue of elastisearch?

Question

I'm getting to much logs in my Elasticsearch server and this log takes too much memory on disk. every 2-3 hour,server is getting around 4 GB logs.

Logs looks like-

[2017-05-08T03:08:14,616][WARN ][o.e.d.r.RestController ] Content type detection for rest requests is deprecated. Specify the content type using the [Content-Type] header

Answer 1

For those using curl, a simple addition of

-H 'Content-Type: application/json'

Made the trick for me

Answer 2

Updating my clients, in my case elasticsearch-model and elasticsearch-rails resolved the issue for me.