Can SOLR perform an UPSERT?

Question

I\'ve been attempting to do the equivalent of an UPSERT (insert or update if already exists) in solr. I only know what does not work and the solr/lucene documentation I hav

Answer 1

With Solr 4.0 you can do a Partial update of all those document with just the fields that have changed will keeping the complete document same. The id should match.