logstash file json absolute path

input {
    file {
        path           => "/home/kimjh/Desktop/ela.dir/query_/n.json"
        type           => "json"
        start_position => "beginning"
        sincedb_path   => "/dev/null"
    }
}

filter {
    ruby {
        code => 'event.set("numCheck", "numberGood")'
    }
}

output {
    stdout {
        codec => rubydebug
    }
}