Solr document server/component

[Jason Rutherglen]

It would be useful to enable a Solr document server (running
Cassandra, HBase, or Voldemort) to be transparently integrated
into a Solr search cluster. Meaning if I do a document update,
Solr underneath sends the document data to the dedicated
document server cluster. When performing a query, the results
would automatically include documents from the document servers.
This would fairly seamlessly separate the stored fields from the
indexed fields. Has there been work along these lines yet?