Hello,
There is an app for Aruba Edgeconnect - https://splunkbase.splunk.com/app/6302
Is there any documentation on how to get the logs ingested into splunk from Aruba EdgeConnect ?
I can not tell from the Aruba documentation very easily, but I would hazard a guess from what I do see is this. The Aruba devices likely forward logs via syslog or HEC, in either case sort out which it is and then follow your Splunk instance current ingestion methods for either of those transport mechanics.