Update to v8.19.6

[docker-elk-updater]

Automated changes by create-pull-request GitHub action

[antoineco]

The pipeline is failing because we are hitting the 90% disk watermark even before the setup is able to complete, so we don't even get a chance to disable the behavior in the workflow:

{"@timestamp":"2025-10-27T07:10:43.630Z", "log.level": "WARN", "message":"high disk watermark [90%] exceeded on [qQNPG8zuQfaFmCPEalPSkA][elasticsearch][/usr/share/elasticsearch/data] free: 6.5gb[9%], shards will be relocated away from this node; currently relocating away shards totalling [0] bytes; the node is expected to continue to exceed the high disk watermark when these relocations are complete", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[elasticsearch][masterService#updateTask][T#4]","log.logger":"org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor","elasticsearch.cluster.uuid":"dSjyc7yfTL6MkdJ8X2e_Pw","elasticsearch.node.id":"qQNPG8zuQfaFmCPEalPSkA","elasticsearch.node.name":"elasticsearch","elasticsearch.cluster.name":"docker-cluster"}
{"@timestamp":"2025-10-27T07:10:45.886Z", "log.level":"ERROR", "message":"failed to retrieve password hash for reserved user [elastic]", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[elasticsearch][transport_worker][T#1]","log.logger":"org.elasticsearch.xpack.security.authc.esnative.ReservedRealm","elasticsearch.cluster.uuid":"dSjyc7yfTL6MkdJ8X2e_Pw","elasticsearch.node.id":"qQNPG8zuQfaFmCPEalPSkA","elasticsearch.node.name":"elasticsearch","elasticsearch.cluster.name":"docker-cluster","error.type":"org.elasticsearch.action.UnavailableShardsException","error.message":"at least one primary shard for the index [.security-7] is unavailable","error.stack_trace":"org.elasticsearch.action.UnavailableShardsException: at least one primary shard for the index [.security-7] is unavailable\n"}

docker-elk/.github/workflows/ci.yml

Lines 71 to 74 in 78c0848

	# Elasticsearch's high disk watermark gets regularly exceeded on GitHub Actions runners.
	# https://www.elastic.co/guide/en/elasticsearch/reference/current/fix-watermark-errors.html
	- name: Disable Elasticsearch disk allocation decider
	run: .github/workflows/scripts/disable-disk-alloc-decider.sh