Use that "${filebeat}" as the password of the elasticsearch output
Filebeat fails to start with message: Exiting: error initializing publisher: can not convert 'string' into 'string' accessing 'output.elasticsearch.password' (source:'/etc/filebeat/filebeat.yml')
Exiting: error initializing publisher: can not convert 'string' into 'string' accessing 'output.elasticsearch.password' (source:'/etc/filebeat/filebeat.yml')