原文地址: https://www.elastic.co/guide/en/elasticsearch/reference/7.7/trigger.html, 原文档版权归 www.elastic.co 所有
IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Triggersedit
Every watch must have a trigger that defines when the watch execution process
should start. When you create a watch, its trigger is registered with the
appropriate Trigger Engine. The trigger engine is responsible for evaluating
the trigger and triggering the watch when needed.
Watcher is designed to support different types of triggers, but only time-based
schedule triggers are currently available.