title: How to create a new fields on Kibana for logs?
body: <p>I configured a Fortimail to send its log messages to the Logstash, however, when I view the logs on the kibana Dashboard.</p>
  
  <p>I want to split the message field on several fields such as : <code>time</code>, <code>device_id</code>, <code>from</code>, <code>to</code> ...</p>
  
  <p>see this picture:</p>
  
  <p><a href="https://i.stack.imgur.com/hHlJc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hHlJc.png" alt="enter image description here"></a> </p>
  
  <p>I do not know how to proceed in order to customize the fields.</p>
  
  <p>Can give me some ideas to know what files to configure?</p>