currently two approaches: http://blog.foofactory.fi/2007/02/online-indexing-integrating-nutch-with.html and: https://issues.apache.org/jira/browse/NUTCH-442
I have had experience with the former... you may have more luck on the nutch-user list for help
ryan Jan Buelens wrote:
Hi, We are currently using Solr as search engine. To add an existing website to our search engine, we are investigating Nutch. Does anyone have more information / experience about an integration between Solr and Nutch? Thanks in advance ! Best regards, Jan