This document discusses using Apache Solr for search in Drupal 7. It notes that in Drupal 7, everything is an entity, including content, users, taxonomy terms, and files. It recommends using Apache Solr modules like apachesolr, apachesolr_user_indexer, and apachesolr_file to index these various entity types for full-text search. Finally, it provides examples of sites using Solr search and links to a tutorial on setting up Solr with Drupal 7.