Ilm_pattern not getting appended to rollover_alias when index is created

[Bhavrendra (Bhavrendra Giri)]

I'm facing problem with ILM_Pattern when i'm taking input to #Logstash from #Filebeat.
The ilm_pattern is not getting appended with ilm_rollover_alias in this case.

Note: Same thing works fine if logstash is taking input from file instead of beats.

input {
    beats {
        port => "5044"
    }
}
output {
  # Sending properly parsed log events to elasticsearch
  elasticsearch {
    hosts => ["localhost:9200"]
	#index => "logstash-%{+yyyy.MM.dd}"
	#index => "%{[@metadata][beat]}-%{+YYYY.MM.dd}-000001"
	ilm_enabled => true
	ilm_rollover_alias => "logstash"
	ilm_pattern => "{now/d}-000001"
	ilm_policy => "logstash"
    #document_type => "%{[@metadata][type]}"
  }
}