Multiline: flush downstream error -> NPE

Elastic Stack Logstash
1

I have a setup of filebeats pushing data to LS which in turn pushes data to ES. I was harvesting on a few files to pump data. To test potential speedup, I started 2 filebeat processes each processing a half of the set of files. I started getting the following error in LS.

[2018-01-23T13:50:33,627][INFO ][org.logstash.beats.BeatsHandler] Exception: Connection reset by peer
[2018-01-23T13:51:23,380][ERROR][logstash.codecs.multiline] Multiline: flush downstream error {:exception=>java.lang.NullPointerException}
[2018-01-23T13:51:23,380][ERROR][logstash.codecs.multiline] Multiline: flush downstream error {:exception=>java.lang.NullPointerException}
[2018-01-23T13:51:23,521][ERROR][logstash.codecs.multiline] Multiline: flush downstream error {:exception=>java.lang.NullPointerException}

The error does not indicate what is the reason for the NPE here. Should I be filing a bug report? I am using filebeat 5.6.4.

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