Change your grok filter so it lists two expressions instead of one (there's an example in the grok filter docs). Let the first expression be a copy if your current expression but with %{GREEDYDATA:syslog_message} replaced with a more specific expression that extracts the fields you want. If you do this, Logstash will try to match against the first expression and as a fallback try the more generic expression (because presumably not all log messages will be of the type contaiing status, client, and operator).
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