If I install all the requirements and run:

python ./search.py --help

without setting SERVICE_URI , I get

Update SERVICE_URI to your cluster uri. Current value for SERVICE_URI=https://user:pass@hostname:port

It's a nice error message, but I'd like to be able to find out the CLI syntax before deciding that I want to start a service.

At the moment, the module config.py ends with

client = OpenSearch(SERVICE_URI, use_ssl=True)

which tries to make the connection to OpenSearch immediately on import. I think it would be simpler to wrap that in a function and get the user to call it when needed.