The instructions in that link mention that Elasticsearch is a dependency for running the CirrusSearch extension, and includes a link with instructions on how to install it locally following multiple installation methods. If you installed it using the
.deb package, this means that it was installed as a systemd unit and will run inside the same VM as a service. You can check this by running the command:
sudo systemctl status elasticsearch.service
You can find more information here.
Please note that you could also run Elasticsearch in a separate VM. Please find more instruction in our Bitnami Elasticsearch Stack page.
With regards to checking if the CirrusSearch extension is actually working, I'm afraid I cannot provide much assistance about it, as I'm not familiar with this extension. You could probably get more accurate answers to questions related to this extension in their talk page.