Apache Solr is both a search engine and a distributed document database with SQL support. Here's how to get started Apache Solr is a subproject of Apache Lucene, which is the indexing technology ...

If you are new to Solr, check out the Solr Quick Start tutorial here. The Learning-to-Rank plug-in documentation is available in this section of the Apache Solr Reference Guide.

Apache Solr is an open source search engine at heart, but it is much more than that. It is a NoSQL database with transactional support. It is a document database that offers SQL support and ...