406, u'Content-Type header [] is not supported

[allwithfly]

C:\Users\1234\Desktop\elasticsearch_loader-master\elasticsearch_loader-master>elasticsearch_loader --es-host http://192.168.1.139:9200 --index index --type index csv telekom_sirovi_podaci.csv
2018-08-07 20:30:55.266000 INFO Loading into ElasticSearch
[------------------------------------]2018-08-07 20:30:55.319000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.320000 WARN Chunk 0 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.360000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.361000 WARN Chunk 1 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.399000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.402000 WARN Chunk 2 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.443000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.444000 WARN Chunk 3 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.483000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.486000 WARN Chunk 4 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.525000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.525000 WARN Chunk 5 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.566000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.569000 WARN Chunk 6 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.609000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.610000 WARN Chunk 7 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.649000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.652000 WARN Chunk 8 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.693000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.693000 WARN Chunk 9 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing
2018-08-07 20:30:55.733000 ERROR attempt [1/1] got exception, it is a permanent data loss, no retry any more
2018-08-07 20:30:55.736000 WARN Chunk 10 got exception (TransportError(406, u'Content-Type header [] is not supported')) while processing

ES Must now be specified content-type

https://www.elastic.co/blog/strict-content-type-checking-for-elasticsearch-rest-requests

[moshe]

Hey @allwithfly, I suspect you had an older version of elasticsearch client installed locally,
can you check what is your installed version?
pip show elasticsearch
I have merged a fix for feature fix

[allwithfly]

Yes, you are right
my elasticsearch version is 1.6.0
Updated
pip install --upgrade elasticsearch
The error no longer appears
thanks.