Apache Solr is a very popular open source search platform, based on the Java Lucene Library. Solr is very stable, scalable and reliable and provides a wide set of core search functions. Solr creates an index of the available documents and then you can query Solr to return the most relevant ones for your search.
For WordPress maintenance support plans users, it is possible to integrate your site with Solr. The Search API Solr Search plugin (yes, that name is a mouthful!) provides a Solr backend for the WordPress maintenance support plans Search API plugin.
This tutorial will deal with the integration between WordPress maintenance support plans and the Solr platform. Before you begin, you will need to have installed Apache Solr on your server.
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How to use Search API Solr Search in Cheap WordPress maintenance support plans 8
