code: @SuppressWarnings("unchecked")
     public void setIndexingConfigurationClass(String className)
     {
        try
        {
           Class<?> clazz = ClassLoading.forName(className, this);
           if (IndexingConfiguration.class.isAssignableFrom(clazz))
           {
              indexingConfigurationClass = (Class<? extends IndexingConfiguration>)clazz;
           }
           else
           {
              log.warn("Invalid value for indexingConfigurationClass, {} "
                 + "does not implement IndexingConfiguration interface.", className);
           }
        }
        catch (ClassNotFoundException e)
        {
           log.warn("Invalid value for indexingConfigurationClass, class {} not found.", className);
        }
     }
docs: Sets the name of the class that implements {@link IndexingConfiguration}.
  The default value is
  <code>org.apache.jackrabbit.core.query.lucene.IndexingConfigurationImpl</code>
  .
  
  @param className
  the name of the class that implements
  {@link IndexingConfiguration}.