从/ usr / local / var卸载elasticsearch并在MacOSX上安装另一个版本

我正在尝试将Mac计算机上的elasticsearch从6.8.4降级到5.6。但是不知何故，我搞砸了现有的6.8.4安装，现在既无法修复当前安装的版本，也无法安装5.6

详细信息：

我已经在系统上正确安装了6.8.4，并且能够成功打入http://localhost:9200/端口并查看版本信息和所有其他详细信息。但是由于依赖性，我不得不将版本降级到5.6

我遵循了本指南https://gist.github.com/govindpatel/0660b33a343b807664972b53c3b12ca0，并通过删除plist条目和其他详细信息来搞怪6.8.4的安装。现在，当我尝试通过输入$ elasticsearch来启动Elasticsearch服务时，我得到：-bash: elasticsearch: command not found和$ brew service restart elasticsearch给我Error: Unknown command: service

但是，当我启动该命令时，我仍然可以看到6.8.4：

$ brew info elasticsearch
elasticsearch: stable 6.8.4,HEAD
Distributed search & analytics engine
https://www.elastic.co/products/elasticsearch
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/elasticsearch.rb
==> Requirements
  Required: java = 1.8 ✔
==> Options
  --HEAD
  Install HEAD version
==> Caveats
  Data:    /usr/local/var/lib/elasticsearch/
  Logs:    /usr/local/var/log/elasticsearch/elasticsearch_Puneet.log
  Plugins: /usr/local/var/elasticsearch/plugins/
  Config:  /usr/local/etc/elasticsearch/


To have launchd start elasticsearch now and restart at login:
  brew services start elasticsearch
Or,if you don't want/need a background service you can just run:
  elasticsearch
==> Analytics
  install: 8,690 (30 days),23,748 (90 days),122,267 (365 days)
  install_on_request: 8,233 (30 days),22,565 (90 days),114,157 (365 days)
  build_error: 0 (30 days)

我什至尝试安装5.6（通过Homebrew）-brew install elasticsearch@5.6，并将PATH设置为~/.bash_profile的第一位，但是没有运气！：（

请提供帮助和建议：

如何修复现有的6.8.4版本，并且
如何系统地对其进行降级（由于现有的conf，数据位于/ usr / local文件夹下）

当前详细信息：查看elasticsearch是否正在运行：$ launchctl list | grep elasticsearch，我得到：- 1 homebrew.mxcl.elasticsearch@5.6，但我当前未安装此软件（已附加o / p）-$ brew uninstall elasticsearch@5.6〜> Error: No such keg: /usr/local/Cellar/elasticsearch@5.6

[UPDATE-1]

发布此内容后，我尝试再次运行ES安装命令：brew install elasticsearch

Updating Homebrew...
==> Auto-updated Homebrew!
  Updated 2 taps (homebrew/core and homebrew/cask).
  No changes to formulae.

==> Downloading 
  https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-6.8.4.tar.gz
Already downloaded: /library/Caches/Homebrew/downloads/elasticsearch-oss-6.8.4.tar.gz
==> Caveats
  Data:    /usr/local/var/lib/elasticsearch/
  Logs:    /usr/local/var/log/elasticsearch/elasticsearch_Puneet.log
  Plugins: /usr/local/var/elasticsearch/plugins/
  Config:  /usr/local/etc/elasticsearch/

To have launchd start elasticsearch now and restart at login:
  brew services start elasticsearch
Or,if you don't want/need a background service you can just run:
  elasticsearch
==> Summary
  ?    /usr/local/Cellar/elasticsearch/6.8.4: 133 files,103.2MB,built in 6 seconds

，然后启动服务$ brew services start elasticsearch〜> ==> Successfully started elasticsearch (label: homebrew.mxcl.elasticsearch)。现在，当我尝试访问端口：http://localhost:9200时，它正在工作（虽然从0开始安装，但已修复了该问题！）

{
  "name" : "DwQRyf7","cluster_name" : "elasticsearch_Puneet","cluster_uuid" : "hLAu9onQSiuQHOpm_e9IKw","version" : {
    "number" : "6.8.4","build_flavor" : "oss","build_type" : "tar","build_hash" : "bca0c8d","build_date" : "2019-10-16T06:19:49.319352Z","build_snapshot" : false,"lucene_version" : "7.7.2","minimum_wire_compatibility_version" : "5.6.0","minimum_index_compatibility_version" : "5.0.0"
  },"tagline" : "You Know,for Search"
}

现在唯一的问题是，如何系统地将其降级？

[UPDATE-2]

现在我有6.8.4，我已经使用brew search elasticsearch检查了其他版本，并得到5.6。然后我用brew install elasticsearch@5.6

安装了5.6

Updating Homebrew...
==> Auto-updated Homebrew!
  Updated 1 tap (homebrew/cask).
  No changes to formulae.
==> Downloading https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.16.tar.gz
  Already downloaded: /library/Caches/Homebrew/downloads/3d7cc028f605699065bd403b0a2383db8d7413c570df57e26fc87a735126c96c--elasticsearch-5.6.16.tar.gz
==> Caveats
  Data:    /usr/local/var/elasticsearch/elasticsearch_Puneet/
  Logs:    /usr/local/var/log/elasticsearch/elasticsearch_Puneet.log
  Plugins: /usr/local/opt/elasticsearch@5.6/libexec/plugins/
  Config:  /usr/local/etc/elasticsearch/
  plugin script: /usr/local/opt/elasticsearch@5.6/libexec/bin/elasticsearch-plugin

elasticsearch@5.6 is keg-only,which means it was not symlinked into /usr/local,because this is an alternate version of another formula.

If you need to have elasticsearch@5.6 first in your PATH run:
  echo 'export PATH="/usr/local/opt/elasticsearch@5.6/bin:$PATH"' >> ~/.bash_profile


To have launchd start elasticsearch@5.6 now and restart at login:
  brew services start elasticsearch@5.6
Or,if you don't want/need a background service you can just run:
  /usr/local/opt/elasticsearch@5.6/bin/elasticsearch
==> Summary
  ?  /usr/local/Cellar/elasticsearch@5.6/5.6.16: 106 files,36.0MB,built in 6 seconds

然后我将5.6添加到$PATH。现在，当我尝试使用brew switch elasticsearch 5.6切换elasticsearch版本时，我得到了：

Error: elasticsearch does not have a version "5.6" in the Cellar.
elasticsearch installed versions: 6.8.4

知道我在这里缺少什么吗？

看起来像是经过一段时间的故障排除后找到的解决方案。

为了在您的开发机器上维护多个版本的elasticsearch，您需要执行以下操作：

比方说我已经安装了6.8.4，并且我还想要另一个版本。为了同时维护两者，请首先输入以下内容检查系统（mac）的所有版本：brew search elasticsearch，并且我的系统支持ES的3个版本：

elasticsearch-最新且稳定（已安装）
elasticsearch@2.4
elasticsearch@5.6

要获得2.4，必须执行以下操作：

$ brew install elasticsearch@2.4
# After installation type:
$ brew services stop elasticsearch
# above command will stop elasticsearch (lastest stable) service
# add 2.4 to $PATH
$ echo 'export PATH="/usr/local/opt/elasticsearch@2.4/bin:$PATH"' >> ~/.bash_profile
# start the service of 2.4
$ brew services start elasticsearch@2.4
# check for the service/installation
$ launchctl list | grep elasticsearch
# above command should show you a port

现在您可以在浏览器中点击http://localhost:9200，它应该显示2.4。

要切换回最新的稳定版本，请执行以下操作：

$ brew services stop elasticsearch
# remove entry from $PATH variable
$ brew services start elasticsearch

在我看来brew switch elasticsearch [VERSION]无效

从/ usr / local / var卸载elasticsearch并在MacOSX上安装另一个版本

wly1zwss 回答：从/ usr / local / var卸载elasticsearch并在MacOSX上安装另一个版本

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