How do I configure FSCrawler?

I’m exploring FSCralwer and ElasticSearch as a means to search through terabytes of OCR’d PDFs. I’ve got ElasitcSearch up and running, but FSCrawler keeps stopping every time it starts. It doesn’t say “crashed,” it says “stopped.”

I assume I’m missing something, all I did was set it up with the default settings from the app catalog, giving it a job name “scandocs.”

Are there environment variables or something that I need to configure? I’ve tried looking in the app-lifecycle.log, but there doesn’t seem to be anything related to the start/stop behavior there.