我的Elasticsearch入門

JiuYou2020發表於2024-03-06

Elasticsearch

一. QuickStart

1. 前言

Quick start | Elasticsearch Guide 8.12

跟著官方文件去學習瞭解Elasticsearch...

2. 註冊Elastic Cloud以獲取免費試用

不自己下載Elastic而是選擇Elastic Cloud的14天[免費試用](Sign up for the Elasticsearch Service with a free 14-day trial | Elastic)

註冊,獲取免費試用的賬戶.
登入到 Elastic Cloud.
點選 Create deployment.
為你的例項起名

點選開啟Kibana的主選單(Elastic徽標附近的"☰")，然後進入DEV Tools>Console。

3. 快速入門

上傳單個文件

/books是索引名,沒有則自動新建
/_doc表明上傳一個文件
?pretty表明返回易閱讀的json格式資料

POST /books/_doc?pretty
{"name": "Snow Crash", "author": "Neal Stephenson", "release_date": "1992-06-01", "page_count": 470}

批次上傳

/_bulk表明批次上傳文件

POST /_bulk
{ "index" : { "_index" : "books" } }
{"name": "Revelation Space", "author": "Alastair Reynolds", "release_date": "2000-03-15", "page_count": 585}
{ "index" : { "_index" : "books" } }
{"name": "1984", "author": "George Orwell", "release_date": "1985-06-01", "page_count": 328}
{ "index" : { "_index" : "books" } }
{"name": "Fahrenheit 451", "author": "Ray Bradbury", "release_date": "1953-10-15", "page_count": 227}
{ "index" : { "_index" : "books" } }
{"name": "Brave New World", "author": "Aldous Huxley", "release_date": "1932-06-01", "page_count": 268}
{ "index" : { "_index" : "books" } }
{"name": "The Handmaids Tale", "author": "Margaret Atwood", "release_date": "1985-06-01", "page_count": 311}

查詢文件

/books表明查詢文件的索引

/_search表明操作為查詢

GET /books/_search?pretty

match查詢

match表明查詢模式

name:brave表明查詢name中含有brave的文件

這是一個執行全文搜尋的標準查詢

GET /books/_search?pretty
{
  "query": {
    "match": {
      "name": "brave"
    }
  }
}

Search your data. Jump here to learn about exact value search, full-text search, vector search, and more, using the search API.

光看文件太枯燥,還是需要用到的時候再去查這些api吧

二. 使用`Canal`同步mysql資料到Elasticsearch

1. 安裝canal-deployer

修改/etc/mysql/mysql.conf.d/mysqld.cnf檔案(配置檔案有好幾個,但是裡面會有介紹,可能會有不同)

新增上面三行

[mysqld]
log-bin=mysql-bin # 開啟 binlog
binlog-format=ROW # 選擇 ROW 模式
server_id=1 # 配置 MySQL replaction 需要定義，不要和 canal 的 slaveId 重複

重啟

service mysql restart

授權 canal 連結 MySQL 賬號具有作為 MySQL slave 的許可權, 如果已有賬戶可直接 grant

CREATE USER canal IDENTIFIED BY 'canal';  
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
-- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;
FLUSH PRIVILEGES;

下載canal,訪問 release 頁面 , 選擇需要的包下載, 如以 1.1.7 版本為例

wget https://github.com/alibaba/canal/releases/download/canal-1.1.7/canal.deployer-1.1.7.tar.gz

解壓縮

mkdir /opt/canal
tar zxvf canal.deployer-1.1.7.tar.gz -C /opt/canal

進入,可以看到如下結構

drwxr-xr-x 7 root root 4096 Mar  4 20:13 ./
drwxr-xr-x 4 root root 4096 Mar  4 20:12 ../
drwxr-xr-x 2 root root 4096 Mar  4 20:21 bin/
drwxr-xr-x 5 root root 4096 Mar  4 20:13 conf/
drwxr-xr-x 2 root root 4096 Mar  4 20:13 lib/
drwxrwxrwx 4 root root 4096 Mar  4 20:21 logs/
drwxrwxrwx 2 root root 4096 Oct 13 14:09 plugin/

配置修改

vim conf/example/instance.properties

## mysql serverId
canal.instance.mysql.slaveId = 1234
#position info，需要改成自己的資料庫資訊
canal.instance.master.address = 127.0.0.1:3306 
canal.instance.master.journal.name = 
canal.instance.master.position = 
canal.instance.master.timestamp = 
#canal.instance.standby.address = 
#canal.instance.standby.journal.name =
#canal.instance.standby.position = 
#canal.instance.standby.timestamp = 
#username/password，需要改成自己的資料庫資訊
canal.instance.dbUsername = canal  
canal.instance.dbPassword = canal
canal.instance.defaultDatabaseName =
canal.instance.connectionCharset = UTF-8
#table regex
canal.instance.filter.regex = .\*\\\\..\*

我只改了slaveId和賬戶密碼

canal.instance.connectionCharset 代表資料庫的編碼方式對應到 java 中的編碼型別，比如 UTF-8，GBK , ISO-8859-1

如果系統是1個 cpu，需要將 canal.instance.parser.parallel 設定為 false

啟動

sh bin/startup.sh

檢視server日誌

cat logs/canal/canal.log

2024-03-04 20:21:04.233 [main] INFO  com.alibaba.otter.canal.deployer.CanalLauncher - ## set default uncaught exception handler
2024-03-04 20:21:04.238 [main] INFO  com.alibaba.otter.canal.deployer.CanalLauncher - ## load canal configurations
2024-03-04 20:21:04.245 [main] INFO  com.alibaba.otter.canal.deployer.CanalStarter - ## start the canal server.
2024-03-04 20:21:04.267 [main] INFO  com.alibaba.otter.canal.deployer.CanalController - ## start the canal server[172.18.0.1(172.18.0.1):11111]
2024-03-04 20:21:05.025 [main] INFO  com.alibaba.otter.canal.deployer.CanalStarter - ## the canal server is running now ......

檢視 instance的日誌

cat logs/example/example.log

2024-03-04 20:21:04.588 [main] INFO  c.a.otter.canal.instance.spring.CanalInstanceWithSpring - start CannalInstance for 1-example
2024-03-04 20:21:05.002 [main] WARN  c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert - --> init table filter : ^.*\..*$
2024-03-04 20:21:05.003 [main] WARN  c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert - --> init table black filter : ^mysql\.slave_.*$
2024-03-04 20:21:05.005 [main] INFO  c.a.otter.canal.instance.core.AbstractCanalInstance - start successful....
2024-03-04 20:21:05.060 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> begin to find start position, it will be long time for reset or first position
2024-03-04 20:21:05.060 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - prepare to find start position just show master status
2024-03-04 20:21:05.641 [destination = example , address = /127.0.0.1:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> find start position successfully, EntryPosition[included=false,journalName=mysql-bin.000002,position=4,serverId=1,gtid=<null>,timestamp=1709554248000] cost : 577ms , the next step is binlog dump

關閉

sh bin/stop.sh

2. 安裝配置ClientAdapter(阿里雲ES)

參考文章

感悟:很多中介軟體升級了版本之後很多舊的配置教程都不管用了,所以最重要的是:

參考官方文件

很多配置見名知意,註釋詳細,注意觀察

參考舊的文件

是參考!!!不是照搬!

前提條件

MySQL 8.0: WSL2 Ubuntu中

ES 8.5: 阿里雲ES

Canal 1.1.7: WSL2 Ubuntu中

操作環境: WSL2 Ubuntu中

已建立MySQL例項、阿里雲ES例項。

已建立MYSQL例項。本文以MySQL 8.0版本為例。
已建立阿里雲ES例項。具體操作請參見建立阿里雲Elasticsearch例項。本文以阿里雲ES 8.5通用版為例。

說明:

透過canal將資料寫入到ES例項中，需將阿里雲ECS例項的IP地址加入ES例項中。具體操作，請參見配置ES例項公網或私網訪問白名單。

使用限制

本方案僅支援將MySQL增量資料同步至阿里雲ES。
安裝的JDK版本必須大於等於1.8.0(本文為1.8)。
Canal 1.1.4版本不支援ES 7.x版本。

ES 7.x版本的資料寫入需使用Canal 1.1.5版本，ES 8.x版本請選擇1.1.7版本。您也可以透過其他方式（例如Logstash、DTS）實現MySQL資料同步。
在進行資料同步時支援自定義索引Mapping，但需保證Mapping中定義的欄位（名稱+型別）與MySQL中一致。
本方案需要您自行保證Canal的可用性，避免出現業務不可用或故障。例如：當出現ECS重啟，Canal異常退出等場景時如何繼續同步資料等。
Canal Adapter不支援使用HTTPS協議連線阿里雲ES例項。

操作步驟

步驟一：準備MySQL資料來源

本文使用的建表語句如下。

-- create table
create database canal;<br>USE canal;
CREATE TABLE product  (
  id bigint(20) NOT NULL AUTO_INCREMENT,
  title varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  sub_title varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  price decimal(10, 2) NULL DEFAULT NULL,
  pic varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (id) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

步驟二：建立索引

Dev-tool位置,見下圖1-4

在這裡將公網白名單加上你的ip地址(ip查詢器)
點選此處也可找到入口
請不要忘記在安全配置頁面將你的ip地址加入公網白名單

在控制檯輸入以下DSL語句並執行

PUT canal_product
{
  "mappings": {
    "properties": {
      "title": {
        "type": "text"
      },
      "sub_title": {
        "type": "text"
      },
      "pic": {
        "type": "text"
      },
      "price": {
        "type": "double"
      }
    }
  }
}

建立成功後，返回如下結果。

{
  "acknowledged" : true,
  "shards_acknowledged" : true,
  "index" : "es_test"
}

步驟三：安裝JDK

檢視可用的JDK軟體包列表。

sudo yum search java | grep -i --color JDK

選擇合適的版本，安裝JDK。

本文選擇java-1.8.0-openjdk-devel.x86_64。
```
sudo yum install java-1.8.0-openjdk-devel.x86_64
```
配置環境變數。
1. 開啟etc資料夾下的profile檔案。
```
vim ~/.bash_profile
```
2. 在檔案內新增如下的環境變數。
```
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
```
  重要
  
  JAVA_HOME需要替換為您JDK的安裝路徑，可透過find / -name 'java'命令檢視。
3. 按下Esc鍵，然後使用:wq儲存檔案並退出vi模式，隨後執行以下命令使配置生效。
```
source ~/.bash_profile
```

執行以下命令，驗證JDK是否安裝成功。

java -version

顯示如下結果說明JDK安裝成功。

openjdk version "1.8.0_362"
OpenJDK Runtime Environment (build 1.8.0_362-b08)
OpenJDK 64-Bit Server VM (build 25.362-b08, mixed mode)

步驟四：安裝並啟動Canal-adapter

先啟動上面安裝的Server

下載Canal-adapter。

本文使用1.1.4版本。
```
wget https://github.com/alibaba/canal/releases/download/canal-1.1.7/canal.adapter-1.1.7.tar.gz
```
說明
- 如果你的是ES 8.0,Canal版本至少在1.1.7及以上
- 目前Canal 1.1.5版本已支援ES 7.0版本，如果您使用的是ES 7.0，需要下載Canal 1.1.5版本。詳細資訊請參見Canal release note。

解壓。

mkdir canal_adapter
tar -zxvf canal.adapter-1.1.7.tar.gz -C canal_adapter/

修改conf/application.yml檔案。

vim conf/application.yml

server:
  port: 8081
spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8
    default-property-inclusion: non_null

canal.conf:
  mode: tcp #tcp kafka rocketMQ rabbitMQ
  flatMessage: true
  zookeeperHosts:
  syncBatchSize: 1000
  retries: 0
  timeout:
  accessKey:
  secretKey:
  consumerProperties:
    # canal tcp consumer
    canal.tcp.server.host: 127.0.0.1:11111
    canal.tcp.zookeeper.hosts:
    canal.tcp.batch.size: 500
    canal.tcp.username:
    canal.tcp.password:
    # kafka consumer
    kafka.bootstrap.servers: 127.0.0.1:9092
    kafka.enable.auto.commit: false
    kafka.auto.commit.interval.ms: 1000
    kafka.auto.offset.reset: latest
    kafka.request.timeout.ms: 40000
    kafka.session.timeout.ms: 30000
    kafka.isolation.level: read_committed
    kafka.max.poll.records: 1000
    # rocketMQ consumer
    rocketmq.namespace:
    rocketmq.namesrv.addr: 127.0.0.1:9876
    rocketmq.batch.size: 1000
    rocketmq.enable.message.trace: false
    rocketmq.customized.trace.topic:
    rocketmq.access.channel:
    rocketmq.subscribe.filter:
    # rabbitMQ consumer
    rabbitmq.host:
    rabbitmq.virtual.host:
    rabbitmq.username:
    rabbitmq.password:
    rabbitmq.resource.ownerId:
# 1. 這裡需要將註釋去掉,並且注意格式對齊,我這裡被坑慘了
  srcDataSources:
    defaultDS:
      url: jdbc:mysql://127.0.0.1:3306/elastic-search-lab?useUnicode=true
      username: root
      password: 123456
  canalAdapters:
  - instance: example # canal instance Name or mq topic name
    groups:
    - groupId: g1
      outerAdapters:
      - name: logger
      # 2. 首先注意對齊,把名稱改成es6/es7/es8
      - name: es8
        hosts: http://es-cn-xxxxxxxxxxxxx.public.elasticsearch.aliyuncs.com:9200 # 127.0.0.1:9200 for rest mode
        properties:
          mode: rest # or rest
          security.auth: elastic:xxxxxxxxxx #  only used for rest mode
          cluster.name: es-cn-xxxxxxxxxxxxx
#      - name: rdb
#        key: mysql1
#        properties:
#          jdbc.driverClassName: com.mysql.jdbc.Driver
#          jdbc.url: jdbc:mysql://127.0.0.1:3306/mytest2?useUnicode=true
#          jdbc.username: root
#          jdbc.password: 121212
#          druid.stat.enable: false
#          druid.stat.slowSqlMillis: 1000
#      - name: rdb
#        key: oracle1
#        properties:
#          jdbc.driverClassName: oracle.jdbc.OracleDriver
#          jdbc.url: jdbc:oracle:thin:@localhost:49161:XE
#          jdbc.username: mytest
#          jdbc.password: m121212
#      - name: rdb
#        key: postgres1
#        properties:
#          jdbc.driverClassName: org.postgresql.Driver
#          jdbc.url: jdbc:postgresql://localhost:5432/postgres
#          jdbc.username: postgres
#          jdbc.password: 121212
#          threads: 1
#          commitSize: 3000
#      - name: hbase
#        properties:
#          hbase.zookeeper.quorum: 127.0.0.1
#          hbase.zookeeper.property.clientPort: 2181
#          zookeeper.znode.parent: /hbase
#      - name: kudu
#        key: kudu
#        properties:
#          kudu.master.address: 127.0.0.1 # ',' split multi address
#      - name: phoenix
#        key: phoenix
#        properties:
#          jdbc.driverClassName: org.apache.phoenix.jdbc.PhoenixDriver
#          jdbc.url: jdbc:phoenix:127.0.0.1:2181:/hbase/db
#          jdbc.username:
#          jdbc.password:

配置項	說明
canal.conf.canalServerHost	canalDeployer訪問地址。保持預設（127.0.0.1:11111）即可。
canal.conf.srcDataSources.defaultDS.url	mysql所在 ip:port
canal.conf.srcDataSources.defaultDS.username	RDS MySQL資料庫的賬號名稱，可在RDS MySQL例項的賬號管理頁面獲取。
canal.conf.srcDataSources.defaultDS.password	RDS MySQL資料庫的密碼。
canal.conf.canalAdapters.groups.outerAdapters.hosts	定位到name:es的位置，將hosts替換為<ES例項的公網地址>:<內網埠>，相關資訊可在ES例項的基本資訊頁面獲取。例如，es-cn-v64xxxxxxxxx3medp.elasticsearch.aliyuncs.com:9200。
canal.conf.canalAdapters.groups.outerAdapters.mode	必須設定為rest。
canal.conf.canalAdapters.groups.outerAdapters.properties.security.auth	需要設定為<ES例項的賬號>:<密碼>。例如elastic:es_password。
canal.conf.canalAdapters.groups.outerAdapters.properties.cluster.name	ES例項的ID，可在ES例項的基本資訊頁面獲取。例如es-cn-v64xxxxxxxxx3medp。

按下Esc鍵，然後使用:wq命令儲存檔案並退出vi模式。
修改conf/es8/mytest_user.yml (對應自己的版本)

dataSourceKey: defaultDS
destination: example
groupId: g1
esMapping:
  # 1. 改索引
  _index: canal_product
  _id: _id
  #  upsert: true
  #  pk: id
  # 2. 該sql
  sql: "SELECT
         p.id AS _id,
         p.title,
         p.sub_title,
         p.price,
         p.pic
        FROM
         product p"
  #  objFields:
  #    _labels: array:;
  etlCondition: "where a.c_time>={}"
  commitBatch: 3000

啟動Canal-adapter服務，並檢視日誌。

./bin/startup.sh
cat logs/adapter/adapter.log

# 這是啟動成功的日誌資訊
2024-03-06 01:16:01.939 [main] INFO  c.a.otter.canal.adapter.launcher.CanalAdapterApplication - Starting CanalAdapterApplication using Java 1.8.0_392 on JiuYou. with PID 15483 (/opt/canal.adapter-1.1.7/lib/client-adapter.launcher-1.1.7.jar started by root in /opt/canal.adapter-1.1.7/bin)
2024-03-06 01:16:01.949 [main] INFO  c.a.otter.canal.adapter.launcher.CanalAdapterApplication - No active profile set, falling back to default profiles: default
2024-03-06 01:16:02.431 [main] INFO  org.springframework.cloud.context.scope.GenericScope - BeanFactory id=a6cee8d1-48d1-3e64-a5f9-a1d1e90caee9
2024-03-06 01:16:02.631 [main] INFO  o.s.boot.web.embedded.tomcat.TomcatWebServer - Tomcat initialized with port(s): 8081 (http)
2024-03-06 01:16:02.639 [main] INFO  org.apache.coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-8081"]
2024-03-06 01:16:02.639 [main] INFO  org.apache.catalina.core.StandardService - Starting service [Tomcat]
2024-03-06 01:16:02.639 [main] INFO  org.apache.catalina.core.StandardEngine - Starting Servlet engine: [Apache Tomcat/9.0.52]
2024-03-06 01:16:02.681 [main] INFO  o.a.catalina.core.ContainerBase.[Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
2024-03-06 01:16:02.681 [main] INFO  o.s.b.w.s.context.ServletWebServerApplicationContext - Root WebApplicationContext: initialization completed in 640 ms
2024-03-06 01:16:03.132 [main] INFO  com.alibaba.druid.pool.DruidDataSource - {dataSource-1} inited
2024-03-06 01:16:03.453 [main] INFO  org.apache.coyote.http11.Http11NioProtocol - Starting ProtocolHandler ["http-nio-8081"]
2024-03-06 01:16:03.461 [main] INFO  o.s.boot.web.embedded.tomcat.TomcatWebServer - Tomcat started on port(s): 8081 (http) with context path ''
2024-03-06 01:16:03.464 [main] INFO  c.a.o.canal.adapter.launcher.loader.CanalAdapterService - ## syncSwitch refreshed.
2024-03-06 01:16:03.464 [main] INFO  c.a.o.canal.adapter.launcher.loader.CanalAdapterService - ## start the canal client adapters.
2024-03-06 01:16:03.467 [main] INFO  c.a.otter.canal.client.adapter.support.ExtensionLoader - extension classpath dir: /opt/canal.adapter-1.1.7/plugin
2024-03-06 01:16:03.487 [main] INFO  c.a.o.canal.adapter.launcher.loader.CanalAdapterLoader - Load canal adapter: logger succeed
2024-03-06 01:16:03.633 [main] INFO  c.a.o.c.client.adapter.es.core.config.ESSyncConfigLoader - ## Start loading es mapping config ... 
2024-03-06 01:16:03.655 [main] INFO  c.a.o.c.client.adapter.es.core.config.ESSyncConfigLoader - ## ES mapping config loaded
2024-03-06 01:16:03.864 [main] INFO  c.a.o.canal.adapter.launcher.loader.CanalAdapterLoader - Load canal adapter: es8 succeed
2024-03-06 01:16:03.869 [main] INFO  c.alibaba.otter.canal.connector.core.spi.ExtensionLoader - extension classpath dir: /opt/canal.adapter-1.1.7/plugin
2024-03-06 01:16:03.880 [main] INFO  c.a.o.canal.adapter.launcher.loader.CanalAdapterLoader - Start adapter for canal-client mq topic: example-g1 succeed
2024-03-06 01:16:03.880 [Thread-4] INFO  c.a.otter.canal.adapter.launcher.loader.AdapterProcessor - =============> Start to connect destination: example <=============
2024-03-06 01:16:03.880 [main] INFO  c.a.o.canal.adapter.launcher.loader.CanalAdapterService - ## the canal client adapters are running now ......
2024-03-06 01:16:03.886 [main] INFO  c.a.otter.canal.adapter.launcher.CanalAdapterApplication - Started CanalAdapterApplication in 2.246 seconds (JVM running for 2.59)
2024-03-06 01:16:03.959 [Thread-4] INFO  c.a.otter.canal.adapter.launcher.loader.AdapterProcessor - =============> Subscribe destination: example succeed <=============

步驟五：驗證增量資料同步

在RDS MySQL資料庫中，新增、修改或刪除資料庫中es_test表的資料。

INSERT INTO product ( id, title, sub_title, price, pic ) VALUES ( 15, '小米8', ' 全面屏遊戲智慧手機 6GB+64GB', 1999.00, NULL );

檢視日誌

2024-03-06 01:17:28.284 [pool-3-thread-1] INFO  c.a.o.canal.client.adapter.logger.LoggerAdapterExample - DML: {"data":[{"id":15,"title":"小米8","sub_title":" 全面屏遊戲智慧手機 6GB+64GB","price":1999.0,"pic":null}],"database":"elastic-search-lab","destination":"example","es":1709659047000,"groupId":"g1","isDdl":false,"old":null,"pkNames":["id"],"sql":"","table":"product","ts":1709659048171,"type":"INSERT"}
2024-03-06 01:17:28.790 [pool-3-thread-1] DEBUG c.a.o.canal.client.adapter.es.core.service.ESSyncService - DML: {"data":[{"id":15,"title":"小米8","sub_title":" 全面屏遊戲智慧手機 6GB+64GB","price":1999.0,"pic":null}],"database":"elastic-search-lab","destination":"example","es":1709659047000,"groupId":"g1","isDdl":false,"old":null,"pkNames":["id"],"sql":"","table":"product","ts":1709659048171,"type":"INSERT"} 
Affected indexes: canal_product

登入目標阿里雲ES例項的Kibana控制檯，具體操作請參見登入Kibana控制檯。
在左側導航欄，單擊Dev Tools。
在Console中，執行以下命令查詢同步成功的資料。
```
GET /product/_search
```
預期結果如下。

Canal同步的是增量資料，不會同步之前的存量資料。

3. 安裝配置ClientAdapter(ElasticCloud)

待更新...

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