Which language is using in watcher?

For watcher programming , which programming language study is needed .

Working with alerting does not require year long programming skills. As you basically just put a bit of JSON to an HTTP endpoint, but parts of this JSON require you to have some programming language to process inputs.
For example, you should take a look at Elasticsearch’s scripting language called Painless - which is similar to Java with a few shorts. Painless in Watcher allows you to parse inputs, execute calculations or transform the data.
Then for the formatting in text we are using mustache, which is a very small templating language without a lot of features.
Hope that helps!

Thank You @Dhanunjaya . Its very helpful for me

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