Arrays 如何在字典的键中提取键

我的结构如下：

mappings": {
"go": {
"_ttl": {something goes here},
"symbol": {},
"associationType.keyword": {},
"go_genes": {},
"go_species.keyword": {},
"symbol.autocomplete": {},
"primaryId": {},
"href.keyword": {},
"name_key": {},
"symbol.sort": {},
"name_key.keyword": {},
"go_type.keyword": {},

现在，我感兴趣的是提取如下内容：

mappings.go.-ttl
mappings.go.symbol
mappings.go.geo_genes
.....

这是我写的代码，但它只给了我go和其他节点，它们的位置与go类似，在图片上没有显示。我如何修改它以获得所述的预期结果：

index = "site_index_stage"
elastic_url = "http://localhost:9200"
mapping_fields_request = "_mapping/field/*"
mapping_fields_url = "/".join([elastic_url, index, mapping_fields_request])
response = requests.get(mapping_fields_url)
print(response)
data = response.content.decode()
parsed_data = json.loads(data)
for key in parsed_data[index]['mappings']:
    print(key)

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最后，我是这样做的：

def nested_dict_iter(nested):
    for key, value in nested.items():
        # print((key,value))
        if type(value)==type({}):
            for x in value:
                output.write(key+'.'+x)
                output.write('\n')
nested_dict_iter(parsed_data[index]['mappings'])

---

@Oighea，更正！我还使用了print[key for key in[parsed_data[index][mappings']].items]。但这给了我一个错误AttributeError:“list”对象没有属性“items”