Pushing flush onto pipeline error without glob issue

I am having this output in logstash and unable to get new index created after the last time it worked last week. This doesnt look like an error but is definitely preventing logstash from creating index on kibana. Can anyone help?

[2019-12-02T14:36:16,359][DEBUG][logstash.agent           ] Starting puma
[2019-12-02T14:36:16,368][DEBUG][logstash.agent           ] Trying to start WebServer {:port=>9600}
[2019-12-02T14:36:16,370][INFO ][org.logstash.beats.Server][main] Starting server on port: 5044
[2019-12-02T14:36:16,420][DEBUG][io.netty.channel.DefaultChannelId][main] -Dio.netty.processId: 25856 (auto-detected)
[2019-12-02T14:36:16,422][DEBUG][io.netty.util.NetUtil    ][main] -Djava.net.preferIPv4Stack: false
[2019-12-02T14:36:16,422][DEBUG][io.netty.util.NetUtil    ][main] -Djava.net.preferIPv6Addresses: false
[2019-12-02T14:36:16,423][DEBUG][io.netty.util.NetUtil    ][main] Loopback interface: lo (lo, 0:0:0:0:0:0:0:1%lo)
[2019-12-02T14:36:16,430][DEBUG][io.netty.util.NetUtil    ][main] /proc/sys/net/core/somaxconn: 128
[2019-12-02T14:36:16,432][DEBUG][io.netty.channel.DefaultChannelId][main] -Dio.netty.machineId: 08:00:27:ff:fe:9b:94:a9 (auto-detected)
[2019-12-02T14:36:16,461][DEBUG][logstash.api.service     ] [api-service] start
[2019-12-02T14:36:16,691][INFO ][logstash.agent           ] Successfully started Logstash API endpoint {:port=>9600}
[2019-12-02T14:36:17,914][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2019-12-02T14:36:17,915][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2019-12-02T14:36:21,213][DEBUG][org.logstash.execution.PeriodicFlush][main] Pushing flush onto pipeline.
[2019-12-02T14:36:22,924][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2019-12-02T14:36:22,926][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2019-12-02T14:36:26,214][DEBUG][org.logstash.execution.PeriodicFlush][main] Pushing flush onto pipeline.

Hi @magnusbaeck, I have read couple of your comments on this issue where some of them have glob errors or in others more data is being waiting to be added or others. In this case, logstash was working perfectly and then just stopped with this debug message printing. Could You please guide which direction to look into for fixing it?