For a Splunk Enterprise non-clustered, distributed environment, can someone point me to documentation that covers server role assignment?

[KevinMurray]

I have inherited a Splunk non-clustered, distributed Enterprise environment. I believe that my Splunk instances have too many server roles assigned to them.

Is there documentation stating:

1. What role(s) should a Heavy Forwarder have?
2. What role(s) should a Search Head have? (Search Head role only, or KV store as well?)
3. What role(s) should an Indexer have? (Indexer role only, or KV store as well?)
4. What role(s) should a Deployment Server have?
5. What role(s) should the DMC Server have? Right now, the 4 server roles, Indexer, KV Store, License Master, and Search Head are assigned to my DMC. It is the License Master for my infrastructure so I know that role is required.

I am having a hard time finding documentation online that explicitly states how the server role assignment should be.

Thanks in advance.