SOLR-5323: Disable ClusteringComponent by default in collection1 example. The solr.clustering.enabled system property needs to be set to 'true' to enable the clustering contrib (reverts SOLR-4708). (Dawid Weiss)



git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1531377 13f79535-47bb-0310-9956-ffa450edef68