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[Docs] Clarify accessing Date methods in painless (#33560)

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The documentation currently tells users to use `doc['event_date'].value.getMillis` to access
milliseconds in a date. It turns out the way it works is `doc['event_date'].value.millis`. This 
change corrects this and gives a hint at how other date related methods work.
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Christoph Büscher 2018-09-19 10:34:53 +02:00 committed by GitHub
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commit 6f3b3338ba
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docs/painless/painless-getting-started.asciidoc
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@ -198,13 +198,11 @@ POST hockey/player/1/_update
==== Dates
Date fields are exposed as
`ReadableDateTime` or
so they support methods like
`getYear`,
and `getDayOfWeek`.
To get milliseconds since epoch call
`getMillis`.
For example, the following returns every hockey player's birth year:
`ReadableDateTime`, so they support methods like `getYear`, `getDayOfWeek`
or e.g. getting milliseconds since epoch with `getMillis`. To use these
in a script, leave out the `get` prefix and continue with lowercasing the
rest of the method name. For example, the following returns every hockey
player's birth year:
[source,js]
----------------------------------------------------------------