Naomi said (post to blacklight-devel lis Aug 3, 2009)

"Fedora (the Digital Object Repository, not RedHat) G-Search seems to
use a field called "pid" as the unique identifier.

"We are trying to run Blacklight on top of a fedora instance that is
using Fedora --> G-search. Blacklight makes assumptions that the
unique id for a SOLR document is named "id". This conflicts with
Fedora's notion of "pid" as the unique identifier for an object ...
which is then pushed into G-Search ... blah blah.

"One solution is to make a copyfield called "id".

"But would it also make sense to avoid hardcoding "id" as a field name
for the unique identifier of SOLR documents in Blacklight?"

Erik said:
"Yes, it makes sense for Blacklight to abstract Solr's uniqueKey setting through some simple indirection."

Bess said:
"Yes, if we're asking the gsearch and active fedora people not to
assume what the unique id field is called, then we can't hard code it
either. We should definitely fix this."