we have facing issues of red cluster status and out of 3, only 1 node is visible.
before that, we have t2.small instance and to resolve the red cluster status, we have upgrade instance type t2.medium
still, clusters are in red and upgrading instance type showing in-progress.
How I resolve it? and how I get back all 3 working nodes?
for now i got message master_not_discovered_exception
or sometimes I also get a message
can anyone help here?