Incoming syslog date missing in timestamp

Hi, I'm receiving Syslog from logstash pipeline and that doesn't have a date field. How can I manipulate the date using the system's current date by matching "message_time"?

"message_time" => "13:51:10"

You could try

mutate { replace => { "message_time" => "%{+YYYY/MM/dd} %{message_time}" } }

Note that this uses the value of [@timestamp], which may be wrong. If syslog sends a message at 23:59:59.999 then logstash will get it the next day and add the next day's date to that time. If that is a dealbreaker then you would have to write some logic in a ruby filter to determine how improbable the resulting date+time is, and how to adjust it.

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