Post-Indexer: Config options at the top of post-indexer.php

Hello everyone! I hope that you are all good. I have successfully installed and activated the plugin. As per your notes in the plugin usage tab:

"There are a few config options at the top of post-indexer.php. Unless you’re in a very solid dedicated environment we recommend leaving them as is"

We have a very solid environment, could you please tell me what config options are these? Thank you for your support and keep up with the great work!