一. 卸载原有elasticsearch
# 查看安装的软件
 dpkg -l | grep elastic
 #查看安装关联
 dpkg -L  elasticsearch
 #移除安装软件
 dpkg -P elasticsearch 
 #继续查看未卸载的目录和文件
 find ./ elasticsearch | grep elasticsearc
 #移除目录和文件具体参考自己的环境
 rm -r /var/lib/elasticsearch
 rm /var/lib/dpkg/info/elasticsearch.*
 rm /etc/default/elasticsearch
 rm /etc/default/elasticsearch
 rm /etc/init.d/elasticsearch
 #在此查看是否有关联的目录和文件
 find ./ elasticsearch | grep elasticsearch

二. 加载ES docker 文件
 1. 创建ES工作文件夹
    mkdir -p /mydata/elasticsearch/
 
 2.上传es6.7.1.tar包到上面文件夹并加载docker镜像
  cd /mydata/elasticsearch/
  docker load < es6.7.1.tar
  
 3.创建挂载ES工作文件夹 

mkdir -p /mydata/elasticsearch/config
mkdir -p /mydata/elasticsearch/data
mkdir -p /mydata/elasticsearch/plugins
echo "http.host: 0.0.0.0" >> /mydata/elasticsearch/config/elasticsearch.yml

4. 非常重要，给上面创建文件夹赋予写权限
chmod -R 777 /mydata/elasticsearch/

5.创建容器并启动(注意将下列命令最后的elasticsearch:6.7.1改为加载后的imageId)
docker run --name elasticsearch -p 9200:9200 -p 9300:9300  -e "discovery.type=single-node" -v /mydata/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml -v /mydata/elasticsearch/data:/usr/share/elasticsearch/data -v /mydata/elasticsearch/plugins:/usr/share/elasticsearch/plugins -d elasticsearch:6.7.1
在浏览器里输入 localhost:9200可验证是否正常启动

6. 修改下列文件解决跨域问题
vim /mydata/elasticsearch/config/elasticsearch.yml
 
 在文件最后添加以下两行并保存
 http.cors.enabled: true
http.cors.allow-origin: "*"

7. 定位至网盘目录 /var/www/html
执行以下命令 
sudo -u apache php ./occ fulltextsearch:index 

如果首次执行失败后，先执行以下重置命令再执行上条命令
sudo -u apache php ./occ fulltextsearch:reset

8.等待索引及数据生成

9. 数据生成后即可在网盘页面搜索相关文件 

10. 加载elastichd.tar文件用来以可视化页面来监测ES状态

docker load < elastichd.tar

docker run -p 9800:9800 -d --link elasticsearch:demo containerize/elastichd

访问地址为：http://localhost:9800


六、创建并启动持续索引服务
由于全文索引需要不停的进行（因为有新的文件进来），做成centos服务

在 /etc/systemd/system/ 目录下创建 nextcloud-fulltext-elasticsearch-worker.service 文件，文件内容如下（用到MySql服务）：

[Unit]
Description=Elasticsearch Worker for Nextcloud Fulltext Search
After=network.target mysql.service
Requires=mysql.service
 
[Service]
User=www
Group=www
WorkingDirectory=/www/wwwroot/test.wxlcloud.com/nextcloud
ExecStart=/usr/bin/php /www/wwwroot/test.wxlcloud.com/nextcloud/occ fulltextsearch:live -q
ExecStop=/usr/bin/php /www/wwwroot/test.wxlcloud.com/nextcloud/occ fulltextsearch:stop
Nice=19
Restart=always
 
[Install]
WantedBy=multi-user.target
开机启动：

systemctl enable nextcloud-fulltext-elasticsearch-worker.service
systemctl start nextcloud-fulltext-elasticsearch-worker.service


nextcloud16 es7.3 全文检索
nextcloud 安装3个app 插件
Full text search
Full text search - Elasticsearch Platform
Full text search - Files

设置插件
设置->全文检索->Servelet地址:http://localhost:9200/
设置->全文检索->[高级] 分析器tokenizer: ik_smart

安装ES插件
# ingest-attachment
/usr/share/elasticsearch/bin/elasticsearch-plugin install ingest-attachment
#安装IK分词
/usr/share/elasticsearch/bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v7.3.0/elasticsearch-analysis-ik-7.3.0.zip
初始化索引
cd /var/www
sudo -u nginx ./occ fulltextsearch:index
创建并启动服务
由于全文索引需要不停的进行（因为有新的文件进来），做成centos服务

vi /etc/systemd/system/nextcloud-fulltext-elasticsearch-worker.service
修改目录 user group 内容 
[Unit]
Description=Elasticsearch Worker for yunpan Fulltext Search
After=network.target
[Service]
User=apache
Group=apache
WorkingDirectory=/var/www/html
ExecStart=/usr/bin/php /var/www/html/occ fulltextsearch:live -q
ExecStop=/usr/bin/php /var/www/html/occ fulltextsearch:stop
Nice=19
Restart=always
[Install]
WantedBy=multi-user.target
#开机启动
systemctl enable yunpan-fulltext-elasticsearch-worker
systemctl start yunpan-fulltext-elasticsearch-worker
问题
pipeline with id [attachment] does not exist
│ Error:      2/2
│ Index: files:478
│ Exception: Elasticsearch\Common\Exceptions\BadRequest400Exception
│ Message: pipeline with id [attachment] does not exist
重建索引
cd /var/www
sudo -u nginx ./occ fulltextsearch:reset
sudo -u nginx ./occ fulltextsearch:index
Search platform (Elasticsearch) down ?
启动ES systemctl start elasticsearch ，当然你需要稍微等一下他启动

In IndexService.php line 253: please add ingest-attachment plugin to elasticsearch
In IndexService.php line 253:
  please add ingest-attachment plugin to elasticsearch 
安装插件
/usr/share/elasticsearch/bin/elasticsearch-plugin install ingest-attachment
The current PHP memory limit is below the recommended value of 512MB
编辑php.ini
memory_limit = 512M
php The posix extensions are required
yum install php-process -y
参考
https://github.com/nextcloud/fulltextsearch/wiki/Basic-Installation


Live index service
(will work with NC 14 and later)

To have your files continuously indexed, you'll need to run fulltextsearch:live. This can be easily achieved on systems running systemd with an unit /etc/systemd/system/nextcloud-fulltext-elasticsearch-worker.service file like this (make sure to adjust WorkingDirectory and path to occ):

[Unit]
Description=Elasticsearch Worker for yupan Fulltext Search
After=network.target

[Service]
User=www-data
Group=www-data
WorkingDirectory=/var/www/html/yunpan
ExecStart=/usr/bin/php /var/www/html/yunpan/occ fulltextsearch:live -q
ExecStop=/usr/bin/php /var/www/html/yunpan/occ fulltextsearch:stop
Nice=19
Restart=always

[Install]
WantedBy=multi-user.target

Note: If you have errors after a system reboot, maybe you have to add your database server to the After and Requires statements.

Note: For mysql or mariadb it looks like:

[Unit]
Description=Elasticsearch Worker for Nextcloud Fulltext Search
After=network.target mysql.service
Requires=mysql.service
...
Enable and start:

systemctl enable yunpan-fulltext-elasticsearch-worker.service
systemctl start yunpan-fulltext-elasticsearch-worker.service
Note: If you want to index external SMB shares, add this to /usr/lib/tmpfiles.d/samba.conf:

d /var/run/samba 2775 root www-data - -