Hi,
Currently, my company has 2 sites (let's say Site A and Site B), and each of them have their own Splunk Enterprise collecting logs specifically for their environment.
However, Site A has Enterprise Security app/license but not Site B. I am wondering if it is possible to "share" this ES functionality from Site A for Site B and have a centralized ES covering Site A and B?
You would surely need to check license entitlement and support ticket/discussion with your splunk account team for your scenario.
Having said that, if site A and site B are subsidiaries of your organisation and if there is a possibility of subnet/ip overlap, you cannot use Splunk ES as it doesn't support multi-tenancy at the moment.
is license used in siteA and SiteB under one entitlement? if yes, I think you can use.
I would advise you to create Splunk support ticket to avoid any legal issues.