How to get specific pieces of log instead of entire log

Elastic Stack Logstash
1

Hello, I was wondering on how I would go about taking only specific pieces of data from a log instead of passing the entire log to elasticsearch. Is there a way to currently do this?

2

Logstash has to read the entire file, but you can use filters to drop data you don't want

filter{
if [message] =~/DEBUG/) {
drop{}
}
}

3

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