ILM policy in logstash is not working

Hi there
My logstash ILM policy is not working, it does not roll over to the new index can please someone help me ?
Can someone please provide me instruction to setup ILM policy in logstash to rollover ?
Thanks

It'd be useful if you shared a little more information in your posts please, simply saying something is working without providing any examples of what you are doing, what you are expecting and what is happening makes it impossible to help.