No hit on indexed field using unified search

Hi,

I have a field CaseNumber that is indexed but I can't get any hits on the field when I search using unified search. The number is present 4 times in the indexed content, as CaseNumber 

"CaseNumber$$string": "2015/12345-6"

and CaseNumber within SearchMetadata 

"CaseNumber": {"StringValue$$string": "2015/12345-6".


Anyone got an idea why?

/Frode