Netflow index file size is not growing

iam running logstash 6.* and i ran the below command and i started to see the netflow data on kibana and my file size of index in elastic search is growing.But after some time lets say 20 minutes i dont see the data on kibana and index file size is not increasing.

Did anyone come across this kind of behavior ?

bin/logstash --modules netflow -M

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