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Watcher inputs

When a watch is triggered, its input loads data into the execution context. This payload is accessible during the subsequent watch execution phases. For example, you can base a watch’s condition on the data loaded by its input.

Watcher supports four input types:

simple: load static data into the execution context.
search: load the results of a search into the execution context.
http: load the results of an HTTP request into the execution context.
chain: use a series of inputs to load data into the execution context.

If you don’t define an input for a watch, an empty payload is loaded into the execution context.

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/input.html