I'm using Logstash to analyze my syslog files. My syslog files have the date like this: Jun 30 06:34:35.
I want have the year to, because I need to use date to filter visualizations on kibana.
I don't use kibana @timestamp because the syslog data are upload just when I need and @timestamp it's different of each syslog date.
How can I do this?