title: Get path to Solr instanceDir with solrj
body: <p>How can I get path to an instanceDir with solrj?</p>
  
  <p>I know the path to SOLR_HOME and I know the actual name of the collection but the actual instanceDir of the collection might be different.
  e.g. the collection with the name "foo" maybe in the directory <code>solr_home/foobar_1/</code> or in <code>solr_home/foobar_0/</code></p>
  
  <p>So how can I find out if the directory of this collection is called foobar_1 or foobar_0 with solrj?</p>