Integrating Solr 8.9.0 and MongoDB 5.0 Community Edition - mongodb

I'm running Solr 8.9.0 and Java 14.0.1 on Linux, and I'm trying to integrate Solr and MongoDB 5.0 Community Edition. I have MongoDB running and loaded with data, and I've installed the mongo-connector.
I'm really struggling with what to do next. All of the documentation that I've found (see a few examples below) is several years old, inconsistent, incomplete and simply doesn't work.
Can anyone please share some documentation / advice on how to integrate Solr and MongoDB?
Thank you.
Muhammad
https://blog.toadworld.com/2017/02/03/indexing-mongodb-data-in-apache-solr
https://hub.packtpub.com/apache-solr-and-big-data-integration-mongodb/
https://github.com/yougov/mongo-connector/wiki/Usage%20with%20Solr
https://chemifinder.wordpress.com/2015/08/19/integrating-mongodb-and-solr-part-3-integrating-mongodb-and-solr/

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