title: Logstash to drop parts of a SNMP field name
body: <p>I'm using the Logstash SNMP input, and am receiving fields like the following:</p>
  
  <p><code>iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEntry.hrStorageAllocationUnits.1"</code></p>
  
  <p>Is there a way I can use a filter to drop everything before hrStorage? </p>