message: env variables need to be wrapped in ""
diff: @@ -12,6 +12,6 @@ output {
  codec => json
  hosts => "${LOGS_FORWARDER_LOGSTASH_TARGET_HOST}"
  ssl_certificate => "certs/lumberjack.cert"
  - port => ${LOGS_FORWARDER_LOGSTASH_TARGET_PORT}
  + port => "${LOGS_FORWARDER_LOGSTASH_TARGET_PORT}"
  }
  }
  