A new alerting system in Kibana is currently under development : https://www.elastic.co/blog/alerting-in-the-elastic-stack
As part of the this effort we want to enable users a migration path for the default Watches that ship with Monitoring to this new system. This requires some way for Kibana to tell Elasticsearch it is now handling the default alerts. Once Kibana is handling the default alerts, Elasticsearch should a) remove existing default monitoring Watches b) prevent new default monitoring Watches from being used.
Note - this only includes the 6 default Watches that ship with monitoring and does not include custom watches.