transaction log is effectively between MCF and Solr.
will likely be already installed and ready to go.
it will take almost as long as a new crawl to re-feed.
you'd add the CouchDB access into to properties.xml.
>> continuous crawling, doing only what is needed on subsequent crawls.
>>> Is there an easy way to separate fetching from ingestion?
>>> Also, after schema changes in Solr, there is a need to re-feed all docs.