Techniques To Improve Your Solr Search Results by Chris Johnson.
From the post:
Solr is a tremendously popular option for providing search functionality in Drupal. While Solr provides pretty good default results, making search results great requires analysis of what your users search for, consideration of which data is sent to Solr, and tuning of Solr’s ‘boosting’. In this post, I will show you a few techniques that can help you leverage Solr to produce great results. I will specifically be covering the Apache Solr Search module. Similar concepts exist in the Search API Solr Search module, but with different methods of configuring boosting and altering data sent to Solr.
If you are interested in using Solr in a Drupal environment, here is a starting place for you.