Logstash-mongodb not creating index

[Bugsbee0716]

Hello
I'm able able to start logstash to fetch data from mongodb
However it's not creating indexes

As I ran in debug I'm seeing below logs , any idea pls?

logstash-pipeline-flush] PeriodicFlush - Pushing flush onto pipeline.
[DEBUG] 2021-08-12 12:10:58.159 [pool-6-thread-1] jvm - collector name {:name=>"ParNew"}
[DEBUG] 2021-08-12 12:10:58.159 [pool-6-thread-1] jvm - collector name {:name=>"ConcurrentMarkSweep"}
[DEBUG] 2021-08-12 12:10:58.537 [[main]<mongodb] mongodb - Updating watch collections
[DEBUG] 2021-08-12 12:10:58.552 [[main]<mongodb] mongodb - No new rows. Sleeping. {:time=>5}
[DEBUG] 2021-08-12 12:11:02.411 [logstash-pipeline-flush] PeriodicFlush - Pushing flush onto p