POST _ml/set_upgrade_mode?enabled=true

resp = client.ml.set_upgrade_mode(
    enabled=True,
)

const response = await client.ml.setUpgradeMode({
  enabled: "true",
});

response = client.ml.set_upgrade_mode(
  enabled: "true"
)

$resp = $client->ml()->setUpgradeMode([
    "enabled" => "true",
]);

curl -X POST -H "Authorization: ApiKey $ELASTIC_API_KEY" "$ELASTICSEARCH_URL/_ml/set_upgrade_mode?enabled=true"