Filebeat has big delay to send log to Kafka


We have log server running filebeat to send log data to Kafka. The log file is on NFS mounted filesystem. we do logrotate hourly, the size of the file is ~18G at the peak time. we have log time and the time received on Kafka. sometimes the delay is up to 5000 seconds.
I tried update the filebeat.yml, like set 'max_proc' to 5, increase the worker to '5', etc. it helps a little, but still see huge delay.
Would anyone can help me with it?


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