code: public float getPropertyBoost(NodeData state, InternalQName propertyName)
     {
        IndexingRule rule = getApplicableIndexingRule(state);
        if (rule != null)
        {
           return rule.getBoost(propertyName);
        }
        return DEFAULT_BOOST;
     }
docs: Returns the boost value for the given property name. If there is no
  configuration entry for the property name the {@link #DEFAULT_BOOST} is
  returned.
  
  @param state
  the node state.
  @param propertyName
  the name of a property.
  @return the boost value for the property.