Grok pattern DATA (.*?) not giving all matches from the line

Elastic Stack Logstash
2

I would use a ruby filter to scan that.

    ruby {
        code => "
            s = event.get('message')
            r = s.scan(/Beginning ([^[:space:]]+) Job/)
            r = r.flatten
            event.set('jobs', r.join(','))
        "
    }

You might then want to mutate+split the jobs field.