Configtest does not support using environment variables

Elastic Stack Logstash
1

As per https://www.elastic.co/guide/en/logstash/current/environment-variables.html

Tried v2.3 and v5.0

E.g.
$ export LS_BEATS_IN_PORT=5044

sample config file

    input {
      beats {
        port => ${LS_BEATS_IN_PORT}
      }
    }

And it fails

$ bin/logstash -t -f test.conf
The given configuration is invalid. Reason: Expected one of #, ", ', -, [, { at line 3, column 13 (byte 31) after input {
  beats {
    port =>  {:level=>:fatal}

If I replace with a number, it works.

2

Use a double-quoted string:

port => "${LS_BEATS_IN_PORT}"