Log ingestion example does not work

Not sure where to ask this as it seems the engagement is low on forums like StackOverflow.
I am looking to make the move from ELK to OpenSearch. The purpose is solely for application log aggregation. I can not find a simple example of how to do this however...the example discussed here https://opensearch.org/docs/latest/observing-your-data/log-ingestion/, does not work and it seems like that documentation is out of date based on what the docker-compose.yml it refers to looks like. In particular the repo does not show any 'data-prepper' in the docker-compose.yml. Additionally, while the example does build and start 3 containers- it does not seem to push any data to opensearch when you make modifications to the test.log file.

So, here i am..asking really just for something that actually works. anything out there? I have been warned that the documentation for this project is very lacking - but i feel like there should be one basic example that new users could follow to get working...just one.

Start with the log-ingestion documentation linked in the issue and compare it with the referenced docker-compose.yml, noting the missing data-prepper service. Run the example and modify test.log to trace whether data reaches OpenSearch. Done means the documented example builds, starts, and visibly ingests the test log data.