title: Logstash with jdbc driver-How to set an initial value for sql_last_value
body: <p>According to Logstash <a href="https://www.elastic.co/guide/en/logstash/current/plugins-inputs-jdbc.html#_predefined_parameters" rel="nofollow noreferrer">documentation</a> the sql_last_value parameter is set to Thursday, 1 January 1970 before any query is run, and stored in the YAML file according to the last_run_metadata_path parameter.
  I need to set this value to a custom value, but because I used Logstash inside a Docker container, I wasn't able to use a custom image with a file initialized with the desired value because the file is read-only in the container and then Logstash throws an error.
  My question is: is it possible to start Logstash with a different initial value than the default in a container installation?
  Thanks.</p>