Data are processing slowly from the Logstash persistent queue to ES

We are facing an issue with Logstash parsing, Initially parsing speed is very high and then it decreases gradually, because of this we have around 10 gb of data in queue. We tried increasing swap size, increasing workers and restarted Logstash nodes but not working as expected. Below are the environment details

Elastic cluster: 3 master + data Nodes

Logstash: 4 Nodes


Ram: 2 servers with 16gb and other servers: 32 gb

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