Thanks for your answer! Too bad, so there is no way to make use of Amazon Spot Instances?
The setup to evaluate:
2 Core Nodes ("Always" available spread over to availability zones)
1 Spot Instance (Not always available)
Default index: 5 Shards, 1 Replica
That should really be possible (by some kind of filters similar to shard allocation), the shutdown of some instance types (spot instances) on AWS does only happen rarelly, so this would be a great way to improve costs...
There is one guy build something like this, but I think it's still not "safe" regarding the replica placement:
I think there is still the risk situation that one core node fails and at the same time the spot instance goes down = cluster broken...
Any suggestions?
Best
Steph