Upgrade Elasticsearch from 6.x to 6.8

upgrade-es-6.x-to-6.8.md

Disable shard allocation

curl -X PUT "localhost:9200/_cluster/settings?pretty" -H 'Content-Type: application/json' -d'
{
  "persistent": {
    "cluster.routing.allocation.enable": "primaries"
  }
}
'

Questions

• If the node to be shutdown has primary shards, what will happen? If it has replica shards, what will happen? What will the allocation process do?

References

• https://www.elastic.co/guide/en/elasticsearch/reference/6.8/rolling-upgrades.html