I have the following questions which not found in the documentation:
1. Any firewall rules to be open between SC and Splunk Heavy Forwarder?
2. Any indexes to be created at the indexers? If yes, what are the steps to create the indexes at my 2 indexers (they are non-clustered).
Adding the app to the indexers will then allow you to configure the data inputs. From there, you will choose which index the data goes to. I've included some screenshots of what you should see on your indexers after the add-on is added.
For item number 2, are you referring to following steps:
To install an add-on to an indexer:
1. Download the add-on from Splunkbase, then unpack the .tgz package.
2. Place the resulting Splunk_TA_ folder in the $SPLUNK_HOME/etc/apps directory on your indexer.
3. Restart the indexer.
Have you performed this? What would be the name of the default indexes created?