Filebeat 8.4.1 slow

I upgraded elk to 8.4.1 recently, from 8.3.2. I noticed that filebeat is much slower reading our zeek logs. I configured filebeat to read from one zeek log (conn.log) and output to the console (redirected to /dev/null). With 8.4.1 on a 500k record file it takes 79 seconds to process. I then
downgraded to filebeat 8.3.2 and ran the same test, and it finished in 45 seconds.

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