When running Elastic Agent and Beats within GKE Autopilot there are storage constraints to be considered. No HostPath volumes are allowed, which the ECK operator defaults to when unset for both Deployments and Daemonsets. Instead use Kubernetes ephemeral volumes.

Refer to Recipes to deploy Elasticsearch, Kibana, Elastic Fleet Server and Elastic Agent and/or Beats within GKE Autopilot.