Logstash Syslog @timestamp incorrect

Elastic Stack Logstash
7

I was able to finally get this to set the correct time by using a very round about way.

mutate {
    add_field => [ "received_at", "%{@timestamp}" ]
}
grok {
    match => {  "received_at" => "%{TIMESTAMP_ISO8601:timestampNoZ}Z" }
}
date {
    timezone => "America/New_York"
    match => ["timestampNoZ", "ISO8601"]
}
mutate {
    remove_field => [ "received_at", "timestampNoZ" ]
}

While I am sure that this can be cleaned up, it does work in getting the timestamp to be adjusted to the correct value.