title: Grok formatting for a custom timestamp
body: <pre><code>[04-21 12:57:04]
  </code></pre>
  
  <p>this is the timestamp generated by python written logs.
  I hav tried </p>
  
  <p>SYSLOGTIMESTAMP, DATESTAMP_EVENTLOG, DATESTAMP_RFC2822,TIMESTAMP_ISO8601</p>
  
  <p>and many more. Can anyone please provide the correct grok format for this.
  If not possible how can i use this as a timestamp</p>