filebeat: Unable to use a keystore if name is "filebeat"

[adrianlzt]

• Version: 8.11.1
• Operating System: almalinux 9.3
• Steps to Reproduce:

1. filebeat keystore add filebeat
2. Use that "${filebeat}" as the password of the elasticsearch output
3. 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')

[botelastic[bot]]

This issue doesn't have a Team:<team> label.

[botelastic[bot]]

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