title: How does Solr's schema-less feature work? How to revert it to classic schema?
body: <p>Just found that <strong>Solr 5</strong> doesn't require a schema file to be predefined and it generates the schema, based on the indexing being performed. I would like to know how does this work in the background?</p>
  
  <p>And whether it's a good practice or not? Is there any way to disable it?</p>