Python elasticsearch-py类库基础用法

实践环境

https://pypi.org/project/elasticsearch/

pip install elasticsearch==7.6.0

离线安装包及依赖包下载地址:

https://files.pythonhosted.org/packages/f5/71/45d36a8df68f3ebb098d6861b2c017f3d094538c0fb98fa61d4dc43e69b9/urllib3-1.26.2-py2.py3-none-any.whl#sha256=d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473

https://files.pythonhosted.org/packages/98/98/c2ff18671db109c9f10ed27f5ef610ae05b73bd876664139cf95bd1429aa/certifi-2023.7.22.tar.gz#sha256=539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082

https://files.pythonhosted.org/packages/1f/12/7919c5d8b9c497f9180db15ea8ead6499812ea8264a6ae18766d93c59fe5/dataclasses-0.8.tar.gz#sha256=8479067f342acf957dc82ec415d355ab5edb7e7646b90dc6e2fd1d96ad084c97

https://files.pythonhosted.org/packages/6b/db/d934d605258d38bd470c83d535c3a73c3d01e4ad357ecb4336300fbb8e88/elastic-transport-8.4.1.tar.gz#sha256=e5548997113c5d9566c9a1a51ed67bce50a4871bc0e44b692166461279e4167e

https://files.pythonhosted.org/packages/94/1a/2369fc9264c655c20908053b59fae7f65ddc47f123d89b533a724ae1d19d/elasticsearch-7.6.0.tar.gz

Python3.6.2

Elasticsearch服务 7.6

注意:elasticsearch-py类库版本必须和Elasticsearch服务器版本保持对应,否则会有兼容性问题,具体如下,

# Elasticsearch 7.x
elasticsearch>=7.0.0,<8.0.0

# Elasticsearch 6.x
elasticsearch>=6.0.0,<7.0.0

# Elasticsearch 5.x
elasticsearch>=5.0.0,<6.0.0

# Elasticsearch 2.x
elasticsearch>=2.0.0,<3.0.0

代码实践

#!/usr/bin/env python
# -*- coding:utf-8 -*-

from elasticsearch import Elasticsearch
from elasticsearch import helpers
from datetime import datetime


def search_data_by_scroll(es, index, body):
    '''翻页查询'''

    request_timeout = 600
    scroll = '20m' # 用于配置scroll有效期--滚动搜索上下文保留时间,默认不能超过 1d (24 小时). 可使用search.max_keep_alive集群配置修改该值

    query_result = es.search(index=index,
                                  scroll=scroll,
                                  body=body,
                                  request_timeout=request_timeout)
    scroll_id = query_result['_scroll_id']

    while len(query_result['hits']['hits']) > 0:
        yield query_result['hits']['hits']
        query_result = es.scroll(scroll_id=scroll_id,
                                      scroll=scroll,
                                      request_timeout=request_timeout)
        scroll_id = query_result['_scroll_id']


if __name__ == '__main__':
    # ES连接相关配置信息
    hosts = [ # ES 集群服务器信息
        {"host": "10.153.1.4", "port": 9200},
        {"host": "10.153.1.5", "port": 9200},
        {"host": "10.153.1.6", "port": 9200}
    ]
    username = 'myusername'  #  ES用户账号 可选配置, 如果无需访问验证, 则配置为空字符串 ''
    password = 'mypassword'  # ES用户密码 可选配置,如果无需访问验证, 则配置为空字符串 ''


    es = Elasticsearch(hosts=hosts,
                       http_auth=(username, password),
                       # 配置连接前进行探测
                       sniff_on_connection_fail = True,  # 节点无响应时刷新节点
                       sniffer_timeout = 60  # 设置超时时间,单位 秒
                       )

    ############### 增 ###############
    #### 创建索引
    #创建索引,如果索引已存在,则报错
    res = es.indices.create(index='my-test-index')
    print(res) # 输出:{'acknowledged': True, 'shards_acknowledged': True, 'index': 'my-test-index'}

    # 创建索引,如果索引已存在,则忽略400错误, 形如 elasticsearch.exceptions.RequestError: RequestError(400, 'resource_already_exists_exception', 'index [my-test-index/rOk1sVW9R46GZq9o7ACVxQ] already exists')
    res = es.indices.create(index='my-test-index', ignore=400)
    print(res) # 输出索引已存在相关错误信息

    # 定义mapping body
    index_mappings = {
        'mappings': { # key固定为 mappings
            'properties': {
                'name': {
                    'type': 'keyword'
                },
                'age': {
                    'type': 'integer'
                },
                'tags': {
                    'type': 'text'
                },
                "timestamp": {
                    "type": "date"
                }
            }
        },
        'settings': {
            'index': {
                'number_of_shards': '3',
                'number_of_replicas': '0'
            }
        }
    }

    # 创建索引的同时,设置mapping
    es.indices.create(index='my-test-index', body=index_mappings, ignore=400)

    #### 为索引创建别名
    # 为单个索引创建别名
    print(es.indices.put_alias(index='my-test-index', name='my-test-index-alias')) # 输出:{'acknowledged': True}

    res = es.indices.create(index='my-test-index2', ignore=400)
    print(res)
    # 为多个索引创建同一个别名,联合查询时用
    print(es.indices.put_alias(index=['my-test-index', 'my-test-index2'], name='test-index-alias')) # 输出:{'acknowledged': True}

    #### 插入数据
    # 插入单条数据
    data = {
        'name': '张三',
        'age': 18,
        'tags': '勤奋',
        'timestamp': datetime.now()
    }
    res = es.index(index='my-test-index', body=data)
    print(res) # 输出:{'_index': 'my-test-index', '_type': '_doc', '_id': 'ELlNE4sBRHfq82dAAhMz', '_version': 1, 'result': 'created', '_shards': {'total': 1, 'successful': 1, 'failed': 0}, '_seq_no': 0, '_primary_term': 1}

    # 插入记录时,指定记录ID
    data = {
        'name': '晓晓',
        'age': 19,
        'tags': '尊师',
        'timestamp': datetime.now()
    }
    res = es.index(index='my-test-index', id=1, body=data)
    print(res) # 输出:{'_index': 'my-test-index', '_type': '_doc', '_id': '1', '_version': 1, 'result': 'created', '_shards': {'total': 1, 'successful': 1, 'failed': 0}, '_seq_no': 2, '_primary_term': 1}


    # 插入记录时,指定文档类型
    # res = es.index(index='mytest-index', doc_type='person', id=1, body=data) # 注意:如果索引不存在,会自动创建索引
    # print(res) # {'_index': 'mytest-index', '_type': 'person', '_id': '1', '_version': 1, 'result': 'created', '_shards': {'total': 2, 'successful': 2, 'failed': 0}, '_seq_no': 0, '_primary_term': 1}


    # 批量插入数据
    insert_records = []
    index_name = 'my-test-index'
    data1 = {
        '_index': index_name,
        'name': '李四',
        'age': 20,
        'tags': '和善',
        'timestamp': datetime.now()
    }
    data2 = {
        '_index': index_name,
        'name': '王五',
        'age': 19,
        'tags': '好学',
        'timestamp': datetime.now()
    }
    insert_records.append(data1)
    insert_records.append(data2)
    res = helpers.bulk(client=es, actions=insert_records)
    print(res) # 输出:(2, [])

    ############### 改 ###############
    #### 更新记录
    # 使用 index 方法 # 注意:使用index实现更新时,body数据必须包含记录的全部字段,否则对应记录,未包含的字段将会被删除
    data = {
        'name': '晓晓',
        'age': 23,
        'timestamp': datetime.now()
    }
    res = es.index(index='mytest-index', id='1', body=data) # id为es中记录的_id值
    print(res) # 输出:{'_index': 'mytest-index', '_type': '_doc', '_id': '1', '_version': 2, 'result': 'updated', '_shards': {'total': 2, 'successful': 2, 'failed': 0}, '_seq_no': 1, '_primary_term': 1}


    # 使用 update 方法
    body = {
        'doc': {
            'tags': '尊师重教',
        }
    }
    res = es.update(index='mytest-index', id='1', body=body)
    print(res) # 输出:{'_index': 'mytest-index', '_type': '_doc', '_id': '1', '_version': 3, 'result': 'updated', '_shards': {'total': 2, 'successful': 2, 'failed': 0}, '_seq_no': 2, '_primary_term': 1}


    ############### 查 ###############
    # 查看全部索引的信息
    index_info = es.indices.get('*')
    # print(index_info) # 输出数据格式同 查看某个索引的信息 调用输出

    # 查看某个索引的信息
    index_info = es.indices.get('mytest-index')
    print(index_info) # 输出:{'mytest-index': {'aliases': {}, 'mappings': {'properties': {'age': {'type': 'long'}, 'name': {'type': 'text', 'fields': {'keyword': {'type': 'keyword', 'ignore_above': 256}}}, 'tags': {'type': 'text', 'fields': {'keyword': {'type': 'keyword', 'ignore_above': 256}}}, 'timestamp': {'type': 'date'}}}, 'settings': {'index': {'search': {'slowlog': {'threshold': {'query': {'warn': '2s', 'info': '1s'}}}}, 'number_of_shards': '1', 'provided_name': 'mytest-index', 'creation_date': '1696837120143', 'number_of_replicas': '1', 'uuid': 'EzxFtEyGQBKPUCu9usa8XA', 'version': {'created': '7060099'}}}}}

    # 查看多个指定索引的信息
    print(es.indices.get(index=['my-test-index', 'mytest-index']))

    # 查询索引相关信息
    body = '''
        {
           "query": {
              "match_all": {}
           }
        }'''
    body = body.strip()
    res = es.search(index=index_name,
                    doc_type='_doc', # 可以配置为None
                    request_timeout=120, # 设置查询超时时间120秒,es默认的查询超时时间是10s
                    body=body) # 注意:这里的body也可以是json,不一定要用字符串
    # print(res)

    # 查看索引是否存在
    print(es.indices.exists('my-test-index'))  # 输出:True

    # 获取指定索引中指定ID的记录信息
    res = es.get(index='mytest-index', id=1)
    print(res) # 输出:{'_index': 'mytest-index', '_type': '_doc', '_id': '1', '_version': 3, '_seq_no': 2, '_primary_term': 1, 'found': True, '_source': {'name': '晓晓', 'age': 23, 'timestamp': '2023-10-09T15:49:53.068134', 'tags': '尊师重教'}}

    # # 获取所有索引中指定ID的记录信息
    # res = es.get(index="*", id="1") # 报错了

    # 查询记录数
    doc_count_info = es.count(index=index_name)
    print(doc_count_info) # 输出:{'count': 4, '_shards': {'total': 3, 'successful': 3, 'skipped': 0, 'failed': 0}}

    # 查询记录信息
    res = es.search(index=index_name,
              request_timeout=120, # 设置查询超时时间120秒,es默认的查询超时时间是10s
              body=body)
    # print(res) # 反回一个字典,同界面查询结果

    # 查询指定索引,指定文档类型,指定ID记录是否存在
    print(es.exists(index='mytest-index', doc_type='doc', id='1')) # 输出:False

    # 查询指定索引中,指定ID记录是否存在
    print(es.exists(index='mytest-index', id='1')) # 输出:True

    # 翻页查询记录信息
    for data in search_data_by_scroll(es, 'index_presale_orderinfo', body):
        print(data) # 输出数据格式为列表, 形如 [{...},{...}]


    # 获取当前集群的基本信息
    print(es.info())

    # 获取集群健康信息
    print(es.cluster.health())

    # 获取整个集群的综合状态信息。
    print(es.cluster.state())

    # 返回群集的当前节点的信息
    print(es.cluster.stats())

    # 获取索引mapping
    print(es.indices.get_mapping(index='my-test-index'))

    # 获取索引设置
    # 获取单个索引的设置
    print(es.indices.get_settings(index='my-test-index'))
    # 获取多个索引的设置
    print(es.indices.get_settings(index=['my-test-index', 'my-test-index2']))
    # 获取所有索引的设置
    print(es.indices.get_settings(index='*'))

    # 获取索引别名
    # 获取单个索引的别名
    print(es.indices.get_alias(index='my-test-index'))
    # 获取多个索引的别名
    print(es.indices.get_alias(index=['my-test-index', 'my-test-index2']))

    # 获取任务列表
    print(es.tasks.list(detailed=True, timeout='60s'))
	
	
    ############### 删 ###############

    # 删除文档记录
    # 按id删除
    res = es.delete(index='mytest-index', id='1')
    print(res) # 输出:{'_index': 'mytest-index', '_type': '_doc', '_id': '1', '_version': 4, 'result': 'deleted', '_shards': {'total': 2, 'successful': 2, 'failed': 0}, '_seq_no': 3, '_primary_term': 1}

    # 按条件删除
    body = {
        'query': {
            'match': {
                'name': '张三'
            }
        }
    }
    res = es.delete_by_query(index=index_name, body=body, ignore=[400, 404])
    print(res) # 输出:{'took': 25, 'timed_out': False, 'total': 1, 'deleted': 1, 'batches': 1, 'version_conflicts': 0, 'noops': 0, 'retries': {'bulk': 0, 'search': 0}, 'throttled_millis': 0, 'requests_per_second': -1.0, 'throttled_until_millis': 0, 'failures': []}

    # 删除索引别名
    # 删除单个索引的别名
    print(es.indices.delete_alias(index='my-test-index', name='my-test-index-alias')) # 输出:{'acknowledged': True}

    # 删除多个索引的指定别名,如果别名不存在,则忽略错误
    # print(es.indices.delete_alias(index=['my-test-index', 'my-test-index2'], name=['test-index-alias']))

    # 删除多个索引的所有别名
    print(es.indices.delete_alias(index=['my-test-index', 'my-test-index2'], name='_all')) # 如果存在索引别名,则会报错


    # 删除索引
    print(es.indices.delete(index_name)) # 输出:{'acknowledged': True}

    # 删除索引,忽略400,404错误,索引不存在时,会报404错误
    print(es.indices.delete(index_name, ignore = [400, 404]))

注意:笔者实践时,发现运行以下语句,会报错

res = es.get(index="*", id="1") # 报错:elasticsearch.exceptions.AuthorizationException: AuthorizationException(403, 'security_exception', 'action [indices:data/read/get] is unauthorized for user [elastic]')

其它说明:

es.scroll(scroll_id=scroll_id, scroll='10m', request_timeout=20)

scroll 时间单位描述:

d   天
h   小时
m   分钟
s   秒

参考链接

https://pypi.org/project/elasticsearch/7.6.0/#description

https://elasticsearch-py.readthedocs.io/en/v8.10.0/

https://elasticsearch-py.readthedocs.io/en/v8.10.0/api.html

http://runxinzhi.com/bubu99-p-13580687.html