Re: Nessus Integration
From the configuration guide:
"This guide provides information for installing the SmartConnector for Tenable Nessus .nessus File and configuring the device for scan report event collection. This SmartConnector supports Nessus Vulnerability Scanner versions 6.5, 6.6, and 6.8."
https://community.softwaregrp.com/t5/ArcSight-Connectors/SmartConnector-for-Tenable-Nessus-nessus-File/ta-p/1583461 (page 3)
Otherwise, you can open the case with support asking for version 7 to be supported.
I hope this helps.