Most of high traffic or complex Drupal sites use Apache Solr as the search engine. It is much faster and more scaleable than Drupal's search module.
In this article, we describe one way of many for having a working Apache Solr installation for use with Drupal 7.x, on Ubunutu Server 12.04 LTS. The technique described should work with Ubunut 14.04 LTS as well.
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