Sorry for taking a long time to respond. I was on vacation.
If you are still getting a message like this one, but with .watches instead of .triggered_watches, you can delete the
You can delete the index template without affecting the index at all. In this case, you'd have something like
DELETE /_index_template/.watches,.triggered_watches
These templates were created before Elasticsearch had the "system index" feature, and Elasticsearch now uses a different internal mechanism to create settings and mappings for .watches and .triggered_watches.