Hello everybody,
I should update my kibana version so that we can use mathematical functions at work, our Kibana version is 4.5.3 and elasticsearch version is 2.3.4.
I searched in internet and found ==> https://www.elastic.co/products/upgrade_guide
and then as i understood I have to talk to Kibana because of that...I have installed Postman and for first step tried ==>"http: // devvs129: 5601 / _snapshot / my_backup"
ande in Key -H in Value kbn-version:4.5.3
but then I have the error message =>
{
"statusCode": 400,
"error": "Bad Request",
"message": "Missing kbn-version header"
}
am very happy if someone can help me with this,ELK is a newland for me 
sorry for my bad English language...
Thanks in advance