=== Native (Application) Search ===
Applications such as this wiki (runs on MediaWiki), and CMS systems (e.g. Drupal) obviously know their own content. So, usually it would suffice to make use of the search facilities built in to the application. However, this doesn't always ring true -- especially when you consider that search as a service in it's own right is probably more powerful than search as a "feature" that is independently tacked on to each application in your stack.
There is a series of articles about the introduction of Full Text Search (FTS) in InnoDB engine for MySQL 5.6 at https://www.percona.com/blog/2013/02/26/myisam-vs-innodb-full-text-search-in-mysql-5-6-part-1/
Users and Implementors of MediaWiki, see [[MediaWiki/Search]].