multiline_codec.conf

input {
    # Make a starting event, and 4 continuation events
    generator {
        type => "generated"
        lines => [
            "Testing1",
            "  Testing2",
            "  Testing3",
            "  Testing4",
            "  Testing5"
        ]
        count => 1
        codec => multiline {
            pattern => "  "
            what => "previous"
        }
    }
}

output {
    stdout { codec => rubydebug }
}