Logstash not closing threads


We're running an Elastic stack on version 7.3.0 with 2 Logstash instances on dedicated VMs each.
The problem we're facing is that Logstash's thread count has grown over 4000 threads over the past 3-4 weeks or so. It looks like Logstash doesn't close old threads? Or do you have any other explanation? The problem is that our monitoring system is triggering an alarm.

Our logstash config


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