How to search within a specific hubsite

Question

Using either Search Query tool or modern search WebParts (SPFx), is it possible to filter results from a specific hub site or site in a hub site ?

In the search query tool view all properties dialog, I don't see any managed property that suggest this is possible.

Answer 1

Ok, quite simply actually.

Thanks to this issue, I found that the DepartmentId corresponds to the hub site.

So, this KQL filters on the hub site :

DepartmentId:"{24af7e54-d2f9-422d-a44e-6a6d40077d50}"

or (no more working)

DepartmentId:"{Site.ID}"

or (credits to @Alberto)

DepartmentId:{{PageContext.hubSiteId}}

if from a web-part.