title: Logstash custom drop filter
body: <p>There is a possibility to match multiple values in filter if statement?</p>
  
  <p>I have some values for which if at least one of them is not present in "message" field I need to drop the log line. Something like this:</p>
  
  <pre><code>if ['value1', 'value2', 'value3'] not in [message] { drop {} }
  </code></pre>
  
  <p>a.k.a if at least one of the values is present in message, then keep the log line, otherwise drop it.</p>
  
  <p>There is a possibility to do something like that in logstash configuration?</p>