apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/api/AdminServiceAPI.java/AdminServiceAPI/updateItem
class AdminServiceAPI:    public void updateItem(String appId, Env env, String clusterName, String namespace, long itemId, ItemDTO item) {
      restTemplate.put(env, "apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/{itemId}",
          item, appId, clusterName, namespace, itemId);

    }