elastic search 索引备份

项目上线之后，由于迭代更新，需要重建索引，但是为了保证重建索引之后出现异常时可以及时滚回上一版本索引，所以需要给目前版本索引进行备份。

from elasticsearch import Elasticsearch
from elasticsearch import helpers
from settings import config
import json
import time

def get_search_result(es_client, es_search_options, scroll='5m', index=config.APPNAME):
    es_result = helpers.scan(
        client=es_client,
        query=es_search_options,
        scroll=scroll,
        index=index
    )
    return es_result

def search(es_client):
    # 检索选项
    es_search_options = {
        "query": {
            "match_all": {}
        }
    }
    es_result = get_search_result(es_client, es_search_options)
    final_result = []
    for item in es_result:
        final_result.append(item['_source'])
    return final_result


if __name__ == '__main__':
    es = Elasticsearch([SEARCH_SERVER])
    st1 = time.time()
    final_results = search(es)
    st2 = time.time()
    with open('zkh_backup.json', 'wr') as outfile:
        json.dump(final_results, outfile)
    print len(final_results)
    print st2 - st1