The parameters go in the URL: POST */_ilm/retry?master_timeout=30m&timeout=30m. However if it's taking more than 30s to do this then there's something very wrong with your cluster, your master is far too busy doing other things. You should investigate (e.g. look at cluster pending tasks) and fix that, not just pile more work onto an already-overloaded master.
A quick noob question, should our logstash point to master nodes, or data nodes? We've pointed it to master node with the assumption that master decides on which shard should the data be kept.
If we send it to data node, can we simply point it to dns of pool of data nodes?
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