Using environment variable on logstash.yml

Good afternoon everyone
I'm trying to follow the documentation example - - referring to the use of variables in logstash.yml more specifically in the attribute I'm putting it as in the example but it does not work:

Here is the excerpt from my logstash.yml that I use:

## ------------  Node identity ------------
## Use a descriptive name for the node:
# 123_${HOSTNAME}
## If omitted the node name will default to the machine's host name


My logstash is in version 6.5.4, has anyone else gone through this?

Obs: No have nothing in log.

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