Comparing number in conditionnal event treatement

[Badger]

That exception will occur if the field does not exist. For example...

input { generator { count => 1 lines => [ '' ] } }
filter {
    mutate { add_field => { "[foo]" => 2501 } }
    mutate { convert => { "[foo]" => integer } }

    if [bar] >= 2500 {
        mutate { add_field => { "[test]" => "Body too long" } }
    }
}
output { stdout { codec => rubydebug { metadata => false } } }

will produce that exception.