def doc_count_all(self):
        raise NotImplementedError
Walks the nodes tree upwards until it finds a node of the class
dataset/ETHPy150Open dokipen/whoosh/src/whoosh/reading.py/IndexReader.doc_count_all--crossover with--dataset/ETHPy150Open los-cocos/cocos/cocos/cocosnode.py/CocosNode.get_ancestor