elasticsearch output Content type detection for rest requests is deprecated

[maayankestler]

Bug report

Hi, I am using the elasticsearch output plugin and i see those warnings in the elasticsearch's logs every telegraf's interval(10s):

[2017-07-10T07:51:00,329][WARN ][o.e.d.r.RestController   ] Content type detection for rest requests is deprecated. Specify the content type using the [Content-Type] header.
[2017-07-10T07:51:10,318][WARN ][o.e.d.r.RestController   ] Content type detection for rest requests is deprecated. Specify the content type using the [Content-Type] header.
[2017-07-10T07:51:20,331][WARN ][o.e.d.r.RestController   ] Content type detection for rest requests is deprecated. Specify the content type using the [Content-Type] header.
[2017-07-10T07:51:30,337][WARN ][o.e.d.r.RestController   ] Content type detection for rest requests is deprecated. Specify the content type using the [Content-Type] header.

when i stop the telegraf service those warnings stop.
i think that this is a problem in the Elasticsearch client and can be fixed by update the client after this commit.
see also this issue.

System info:

Telegraf v1.3.3 (git: release-1.3 46db92a)
Elasticsearch v5.5.0
Ubuntu 16.04.2 LTS

[danielnelson]

Thanks for tracking down the cause of this, I updated the elastic client and it will be in 1.4