How to replace @timestamp with logtime?

Elastic Stack Logstash
3

Try this -

filter {
    mutate {
	add_field => { "message" => "%{typenameru}" }
        convert => [ "datetime", "string" ]
}
date {
    timezone => "Etc/UTC"
    match => ["datetime" , "ISO8601", "yyyy-MM-dd HH:mm:ss.SSS"]
    target => "@timestamp"
    remove_field => [ "datetime", "timestamp" ]
}
}

For me it is helped.