: Yes, it's the cache. But not document/query/filter cache, but http : cache. Yes, you can disable it in solrconfig.xml
Specificly: it is (probably) your browser cache, as Solr doesn't cache anything between restarts. Info about disabling (or changing the rules for) HTTP caching can be found here... http://wiki.apache.org/solr/SolrConfigXml#HTTP_Caching -Hoss
