Here are some resources that may help you with integration of SOLR and 5.6.1 - http://www.gastongonzalez.com/tech-blog/2013/9/13/integrating-apache-solr-with-adobe-cq-aem.htmlhttp://www.wemblog.com/2012/01/how-to-reduce-lucene-index-size-in-cq.htmlRegards,Alva

Deponds on use case & number of instance running, Weather you are using application server etc... Most of use case selectors works better. Might be you are looking [1].[1] http://svn.apache.org/viewvc/sling/trunk/contrib/extensions/cache/ehcache/src/main/java/org/apache/sling/commons/cache/ehcache/CacheManagerServiceImpl.java?view=markup