Empty message field in exec input field

Elastic Stack Logstash
1

Hello,

I'm trying to get information from Glusterfs. when I use exec command, sometimes it returns empty message. what is the reason and how can I fix that?
my command is like this:
gluster volume profile dkv info | grep -E 'Data\ Read|Duration|Brick:' | sed -n 1,5p

2

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