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Enable and disable Elasticsearch cluster shard allocation

There will come a time when you need to perform a rolling restart of your cluster—keeping the cluster online and operational, but taking nodes offline one at a time. .. By nature, Elasticsearch wants your data to be fully replicated and evenly balanced. If you shut down a single node for maintenance, the cluster will immediately recognize the loss of a node and begin rebalancing.

Disable shard allocation. This prevents Elasticsearch from rebalancing missing shards until you tell it otherwise.

curl -XPUT 'http://localhost:9200/_cluster/settings' -d '{
    "transient" : {
        "cluster.routing.allocation.enable" : "none"
    }
}'

Reenable shard allocation as follows:

curl -XPUT 'http://localhost:9200/_cluster/settings' -d '{
    "transient" : {
        "cluster.routing.allocation.enable" : "all"
    }
}'