First, you should know about the Inherited Deployments manual (https://docs.splunk.com/Documentation/Splunk/8.0.1/InheritedDeployment/Introduction). It contains a lot of good guidance on how to figure out what you have.
Obviously, something changed a few weeks ago. Finding it will be the challenge.
Start by verifying the forwarder is running. Verify it can connect to the indexer ("enterprise"). If it can't, check the firewalls on each server as well as the AWS security groups on each end.
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