Reset Persistent Elasticsearch Cluster Setting

This post is older than a year. Consider some information might not be accurate anymore.

If you setup Elasticsearch to report to a dedicated monitoring cluster

PUT _cluster/settings
{
  "persistent": {
    "xpack.monitoring.exporters.cloud_monitoring.type": "http",
    "xpack.monitoring.exporters.cloud_monitoring.host": "MONITORING_ELASTICSEARCH_URL",
    "xpack.monitoring.exporters.cloud_monitoring.auth.username": "cloud_monitoring_agent",
    "xpack.monitoring.exporters.cloud_monitoring.auth.password": "MONITORING_AGENT_PASSWORD"
  }
}

you can unset or reset it with, passing null.

PUT _cluster/settings
{
  "persistent": {
    "xpack.monitoring.exporters.cloud_monitoring.type": null,
    "xpack.monitoring.exporters.cloud_monitoring.host": null,
    "xpack.monitoring.exporters.cloud_monitoring.auth.username": null,
    "xpack.monitoring.exporters.cloud_monitoring.auth.password": null
  }
}

In the logs of the master node, following log message will appear

[2017-10-09T15:30:40,007][INFO ][o.e.c.s.ClusterSettings  ] [master-one] updating [xpack.monitoring.exporters.] from [{"cloud_monitoring":{"host":"monitornode","type":"http","auth":{"password":"mapperking","username":"remote_monitor"}}}] to [{}]