Watcher alert for cluster nodes memory and disk

Hello friends,
I want to know how I Can configure a watcher to alert when Elasticsearch nodes free memory or free disk space goes below a threshold?
I mean what input search I should use in watcher JSON?
Can you give me a sample?
Thank you

yes you can use watcher to call elastic APIs.

Refer topic "Calling Elasticsearch APIs" where you can know about your full cluster stats such as "OS, Mem, Storage etc". Hope this answers your question.

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