How to force Logstash to reparse a file?

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By default logstash writes the position is last was on to a logfile which usually resides in $HOME/.sincedb. Logstash can be fooled into believing it never parsed the logfile by specifying /dev/null as sincedb_path.

Here the part of the documentation Input File.

Where to write the since database (keeps track of the current position
of monitored log files). Defaults to the value of environment variable
“$SINCEDB_PATH” or “$HOME/.sincedb”.

Config Example

input {
    file {
        path => "/tmp/logfile_to_analyse"
        start_position => "beginning"
        sincedb_path => "/dev/null"
    }
}

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