How to force filebeat to send older logs to logstash without duplication

Hello, I have set up the Filebeat to send logs to Logstash. How can I make it send older logs that had not been parsed, to Logstash? Will the logs that have been parsed up to now be duplicated?
Can I specify a period of time for old logs in order to avoid duplication of the existing logs?
Can someone explain it to me? Thanks in advance!

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