public void delete(final String key) {
        try {
            client.delete().guaranteed().deletingChildrenIfNeeded().forPath(key);
        } catch (Exception e) {
            throw new ShenyuException(e);
        }
    }
delete a node with specific key.

@param key zookeeper path key.
shenyu-sync-data-center/shenyu-sync-data-zookeeper/src/main/java/org/apache/shenyu/sync/data/zookeeper/ZookeeperClient.java