Need immediate log files to read in some program

[mahsashadi]

Working with file output plugin, I need to write my logs immediately, because I am using these files (at the same time the logs are generated) in my program.

what configs are suggested? I am using timekey 1
Should I read buffer files in my program?

<match hafez_rclone.copy>
  @type file
  path /fluentd/rclone_app
  <buffer>
    timekey 1
  </buffer>
</match>