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[DOC] Clarify the scope of environment variable expansion (#13299) (#13311)

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Environment variable expansion only works in plugin parameters, not in conditionals.
For more on this limitation see https://github.com/elastic/logstash/issues/5115

(cherry picked from commit 096eb7ac48)
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João Duarte 2021-10-13 14:23:27 +01:00 • committed by GitHub
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docs/static/configuration.asciidoc vendored
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@ -726,6 +726,10 @@ environment variable is undefined.
* You can add environment variable references in any plugin option type : string, number, boolean, array, or hash.
* Environment variables are immutable. If you update the environment variable, you'll have to restart Logstash to pick up the updated value.
NOTE: Environment variable references are only supported in plugin configuration, not in {logstash-ref}/event-dependent-configuration.html#conditionals[conditionals]. A workaround for this limitation is to add a new event field with the value
of the environment variable and use that new field in the conditional.
==== Examples
The following examples show you how to use environment variables to set the values of some commonly used