[root@CentOS ~]# java -version

[root@CentOS ~]# yum -y install java-1.8.0-openjdk

# 1. Download and install the public signing key
[root@CentOS ~]# rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

# 2. Create yum repository
[root@CentOS ~]# vim /etc/yum.repos.d/elasticsearch.repo
内容如下：

[elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

# 3. Install Elasticsearch
[root@CentOS ~]# yum -y install elasticsearch
[root@CentOS ~]# systemctl start elasticsearch.service
[root@CentOS ~]# systemctl enable elasticsearch.service

[root@CentOS ~]# curl 'http://localhost:9200/?pretty'
{
  "name" : "CentOS",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "VCi-CCWYRjaInhykJS4asg",
  "version" : {
    "number" : "7.0.0",
    "build_flavor" : "default",
    "build_type" : "rpm",
    "build_hash" : "b7e28a7",
    "build_date" : "2019-04-05T22:55:32.697037Z",
    "build_snapshot" : false,
    "lucene_version" : "8.0.0",
    "minimum_wire_compatibility_version" : "6.7.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

network.host: localhost, 192.168.40.121
discovery.seed_hosts: ["localhost", "192.168.40.121"]

[root@CentOS ~]# /usr/share/elasticsearch/bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v7.0.0/elasticsearch-analysis-ik-7.0.0.zip

[root@CentOS ~]# ls /usr/share/elasticsearch/plugins
analysis-ik
[root@CentOS ~]# /usr/share/elasticsearch/bin/elasticsearch-plugin list
analysis-ik

(venv)$ pip install elasticsearch
(venv)$ pip freeze > requirements.txt

In [1]: from elasticsearch import Elasticsearch

In [2]: es = Elasticsearch('http://192.168.40.121:9200')

In [3]: es.indices.create(index='posts', ignore=400)  # 1. 创建名为 posts 的Index
Out[3]: {'acknowledged': True, 'shards_acknowledged': True, 'index': 'posts'}

In [4]: mapping = {
   ...:     'properties': {
   ...:         'content': {
   ...:             'type': 'text',
   ...:             'analyzer': 'ik_max_word',
   ...:             'search_analyzer': 'ik_max_word'
   ...:         }
   ...:     }
   ...: }

In [5]: es.indices.put_mapping(index='posts', body=mapping)  # 2. 设置Mapping，每个文档有个 content 字段，它的类型是 text，词法分析器是 ik
Out[5]: {'acknowledged': True}

In [6]: es.index(index='posts', id=1, body={'content': '美国留给伊拉克的是个烂摊子吗'})  # 3. 插入文档，每个文档必须使用唯一的 id
Out[6]:
{'_index': 'posts',
 '_type': '_doc',
 '_id': '1',
 '_version': 1,
 'result': 'created',
 '_shards': {'total': 2, 'successful': 1, 'failed': 0},
 '_seq_no': 0,
 '_primary_term': 1}

In [7]: es.index(index='posts', id=2, body={'content': '公安部：各地校车将享最高路权'})
Out[7]:
{'_index': 'posts',
 '_type': '_doc',
 '_id': '2',
 '_version': 1,
 'result': 'created',
 '_shards': {'total': 2, 'successful': 1, 'failed': 0},
 '_seq_no': 1,
 '_primary_term': 1}

In [8]: es.index(index='posts', id=3, body={'content': '中韩渔警冲突调查：韩警平均每天扣1艘中国渔船'})
Out[8]:
{'_index': 'posts',
 '_type': '_doc',
 '_id': '3',
 '_version': 1,
 'result': 'created',
 '_shards': {'total': 2, 'successful': 1, 'failed': 0},
 '_seq_no': 2,
 '_primary_term': 1}

In [9]: es.index(index='posts', id=4, body={'content': '中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首'})
Out[9]:
{'_index': 'posts',
 '_type': '_doc',
 '_id': '4',
 '_version': 1,
 'result': 'created',
 '_shards': {'total': 2, 'successful': 1, 'failed': 0},
 '_seq_no': 3,
 '_primary_term': 1}

In [10]: es.search(index='posts', body={'query': {'match': {'content': '中国'}}})  # 4. 搜索 '中国'
Out[10]:
{'took': 188,
 'timed_out': False,
 '_shards': {'total': 1, 'successful': 1, 'skipped': 0, 'failed': 0},
 'hits': {'total': {'value': 2, 'relation': 'eq'},
  'max_score': 0.6548752,
  'hits': [{'_index': 'posts',
    '_type': '_doc',
    '_id': '3',
    '_score': 0.6548752