title: Logstash parsing unix time in milliseconds since epoch
body: <p>I am trying to match <strong>unix time in milliseconds since epoch</strong> in logstash/grok using the UNIX_MS pattern and I am getting : </p>
  
  <blockquote>
    <p>pattern %{UNIX_MS:timestamp} not defined</p>
  </blockquote>
  
  <p>The <code>UNIX_MS</code> is defined <a href="http://logstash.net/docs/1.4.2/filters/date" rel="nofollow">Logstash Date Log</a>, and when I run with <code>--configtest</code>, the test passes, so I would expect this to work.</p>
  
  <p>Example input: <code>1415731504.54126,metric1,130</code></p>
  
  <p>My <code>.conf</code>:</p>
  
  <pre><code>filter {
      grok {
       match =&gt; [ "message", "%{UNIX_MS:timestamp},%{WORD:metric_type},%{BASE16FLOAT:value}" ]
      }
  }
  </code></pre>