Update verzie elasticsearch:

Krok1:

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

Krok2:

curl -X POST "localhost:9200/_flush/synced?pretty"

Krok3:

curl -X POST "localhost:9200/_ml/set_upgrade_mode?enabled=true&pretty"

Krok4:

systemctl stop elasticsearch.service
apt upgrade -y

Krok5:

curl -X GET "localhost:9200/_cat/nodes?pretty"

Krok6:

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

Krok7:

curl -X GET "localhost:9200/_cat/health?v&pretty"

Krok8:

curl -X POST "localhost:9200/_ml/set_upgrade_mode?enabled=false&pretty"

DOC:

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