Troubles with setting @timestamp

In my logstash config i have this filter:
filter {
json {
source => "message"
target => "json_data"
}
date {
match => ["log_timestamp", "yyyy-MM-dd HH:mm:ss.SSS"]
target = "@timestamp"
}
}
log timestamp: {"log_timestamp": "2018-11-15 11:27:10.130"}
But @timestamp isn't overrides. Believe anyone can help me.

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