The ExtraHop Splunk App may not be what you are most interested in. If what you want is to build dashboards or reports on ExtraHop wire data, you need to configure Splunk as your Syslog SIEM entry in ExtraHop. You can then build triggers to send custom fields and values to Splunk.
Check out this article on ExtraHop Forum
ExtraHop To Splunk Article
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It's true that the current 3.7 version of ExtraHop Discovery Edition doesn't have triggers, but the upcoming 3.8 version of Discovery Edition will in fact have them, so it will be suitable for Splunk integration.
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