OpenSearch/docs/reference/setup/upgrade/disable-shard-alloc.asciidoc

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When you shut down a node, the allocation process waits for one minute
before starting to replicate the shards on that node to other nodes
in the cluster, causing a lot of wasted I/O. You can avoid racing the clock
by disabling allocation before shutting down the node:
[source,js]
--------------------------------------------------
PUT _cluster/settings
{
"persistent": {
"cluster.routing.allocation.enable": "none"
}
}
--------------------------------------------------
// CONSOLE
// TEST[skip:indexes don't assign]