Alfresco Content Services supports use of the Solr search platform for searching within the repository.
Solr is an open source enterprise search platform that uses lucene as indexing and search engine. Solr is written in Java and runs as a standalone search server. Alfresco Content Services sends HTTP and XML input to Solr and searches for content. Solr updates the cores or indexes and returns the result of the query in XML or JSON format.
In all previous Alfresco Content Services versions, Solr.war was bundled with the repository. With Alfresco Content Services 5.2.3, you no longer deploy a Solr.war to your application server. Solr 6 is an independently executable standalone application powered by a Jetty server. Alfresco Content Services 5.2 uses Solr 4 as the default search service index. For an improved and efficient search functionality, you can upgrade to Alfresco Content Services with Alfresco Search Services (Solr 6).
There are two cores or indexes in Solr:
alfresco: used for searching all live content stored at <SOLR_HOME>/solrhome/alfresco within the Solr search server.
archive: used for searching content that has been marked as deleted at <SOLR_HOME>/solrhome/archive within the Solr search server.
Important: For security reasons, it is advised that you generate a new set of keys to secure your Solr communication and access to the Solr Admin Console.
For more information, see Configure using the Admin Console and Secure keys.