My application sends JSON messages to Filebeat through TCP. Filebeat parsing the messages add some Filebeat specific fields and forwards it to Elasticsearch/Kibana.
I have an xxtimestamp field in the JSON message which contains an ISO8601 timestamp, like '2020-01-02T12:34:56.123456Z'
I'd like to replace @timestamp's field content with xxtimestamp's content.
Its working with the config above but this method cuts off the microseconds part
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