Update 20-dns-syslog.conf

fixed date filter plugin condition depending if its :
"MMM  d HH:mm:ss" OR "MMM dd HH:mm:ss"

logstash/conf.d/20-dns-syslog.conf

@@ -150,7 +150,7 @@ filter {
     }
 	
   date {
-    match => [ "date", "MMM  d HH:mm:ss" ]
+    match => [ "date", "MMM  d HH:mm:ss","MMM dd HH:mm:ss" ]
   }
 
   }