In January 2007 , Solr graduated from incubation status into a standalone top - level project ( TLP ) .
In January 2007 , Solr grew steadily with accumulated features , thereby attracting users , contributors , and committers .
In January 2007 , Solr graduated from incubation status into a standalone top - level project ( TLP ) and grew steadily with accumulated features , thereby attracting users , contributors , and committers .