title: I want to build a search engine with Solr/Lucene
body: <p>I want to build a search engine with Solr/Lucene. Shall I use for that Apache Solr 3 or 4 (I think in this context Solr=Lucene)? Furthermore, I have the Lucene in Action, 2nd Edition (for Lucene 3) from 2010. Is this book already obsolete? Which books do you recommend for beginners?  </p>