DIH and UpdateRequestProcessor#finish

[Erik Hatcher]

Shouldn't DIH, I presume in either SolrWriter or DataImportHandler,  
call processor.finish()?

Maybe DataImportHandler should subclass ContentStreamHandlerBase,  
which calls #finish already.  This would mean we implement a new  
ContentStreamLoader.  This would allow DIH to hand the streams off as  
either data sources or data to entities, right?  This is where we want  
to head with Tika integration into DIH, methinks.

Thoughts?

        Erik