Python elasticsearch.helpers.scan 例子

Question

有人可以提供 python elasticsearch helpers 客户端的扫描 API 示例吗？

res = elasticsearch.helpers.scan(....)

如何使用 res 对象从 elasticsearch 中获取所有结果？

Answer 1

documentation includes an example, although if I'm reading it right, helpers.scan by default sets search_type=scan, which was removed in ES 5.1。这会导致示例代码失败，ES 返回 No search type for [scan]。我们可以用 preserve_order=True 修改它（但是我不确定这里的性能影响）：

import elasticsearch
import elasticsearch.helpers
es = elasticsearch.Elasticsearch()
results = elasticsearch.helpers.scan(es,
    index="test_index",
    doc_type="my_document",
    preserve_order=True,
    query={"query": {"match_all": {}}},
)

for item in results:
    print(item['_id'], item['_source']['name'])

此助手 returns 一个对象，您可以迭代该对象以从查询中获取实际结果。

item 的形式是

{'_index': <str>, '_type': <str>, '_id': <str>, '_score': <float or None>, '_source': {'key': val}, 'sort': [<int>]}

Python elasticsearch.helpers.scan 例子

Python elasticsearch.helpers.scan example

python

python-2.7

elasticsearch

elasticsearch-5