code: public float getNodeBoost(NodeData state)
     {
        IndexingRule rule = getApplicableIndexingRule(state);
        if (rule != null)
        {
           return rule.getNodeBoost();
        }
        return DEFAULT_BOOST;
     }
docs: Returns the boost for the node scope fulltext index field.
  
  @param state
  the node state.
  @return the boost for the node scope fulltext index field.