Error loading config when keystore secret or environment variables are not valid JSON

[adriansr]

Due to elastic/go-ucfg#132, Beats will fail to parse the configuration when the value of a variable from the keystore or the environment starts with [, {, " and '.

With:

output.elasticsearch:
  username: "${MYUSER}"

the following fails:

$ MYUSER='"hello' ./filebeat run -e
Exiting: error initializing publisher: Missing " to close string  when parsing '"hello' accessing 'output.elasticsearch.username' (source:'filebeat.yml')
$ MYUSER='{user}' ./filebeat run -e
Exiting: error initializing publisher: expected ':' when parsing '{user}' accessing 'output.elasticsearch.username' (source:'filebeat.yml')

[botelastic]

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[botelastic]

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