There is a simplified option for ingesting log files with Elastic Agent. The simplest input configuration to ingest the file /var/log/my-application/log-file.log is:

inputs:
  - type: filestream 
    id: unique-id-per-input 
    paths: 
      - /var/log/my-application/log-file.log

For other custom options to configure the input, refer to the filestream input in the Filebeat documentation.