We would like to perform an OS migration from UBunto to RHEL.
Our Cluster is 2 nodes, ES Version of 1.3.7 and Logstash 1.4.2
We would like to go to ES 1.7.1 and Logstash 1.5.4
(*) ES 1.7.1 because we need the use of http-basic plugin.
I am very limited with resources, And would like to perform the OS migration and ES upgrade on the actual nodes of the cluster.
Can someone consult on the best and safer way to do so ?
Is it possible to have a two nodes cluster with different OS on each ? (One with UBunto and second with RHEL)