code: public void setClasspathRoot(String classpathRoot) {
          // For compatibility reasons, we need to convert "/classpathroot" to "classpathroot"
          if (classpathRoot.startsWith("/")) {
              this.classpathRoot = classpathRoot.substring(1, classpathRoot.length());
          } else {
  
              this.classpathRoot = classpathRoot;
          }
      }
docs: Classpath root for index and mapping files (default : /es)
  <p>Example :</p>
  <pre>
  {@code
  <property name="classpathRoot" value="/es" />
  }
  </pre>
  That means that the factory will look in es folder to find index and mappings settings.
  <br>So if you want to define a mapping for the _doc type in the twitter index, you
  should put a _doc.json file under /es/twitter/ folder.
  @param classpathRoot Classpath root for index and mapping files
  @see #setMappings(String[])