我正在尝试将Elastic Search从7降级到6，因为我使用的应用程序只能在6上运行。
当我安装6时，由于某种原因，我被提升到7：

{
  "name" : "activecollab-v6",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "D7qs_zqTTX6Rv8AiE_ioqw",
  "version" : {
    "number" : "7.1.0",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "606a173",
    "build_date" : "2019-05-16T00:43:15.323135Z",
    "build_snapshot" : false,
    "lucene_version" : "8.0.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

字符串
我如何确保我被降级？下面是我的安装配方，下面是配方报告，显示ElasticSearch也安装了。

# Install Elastic Search

echo ">> Installing Elastic GPG Key"
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -

echo ">> Install apt-transport-https"
apt install apt-transport-https

echo ">> Adding deb package"
echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list

echo ">> Updating apt"
apt update

echo ">> Installing Java and Elastic Search"
apt -y install default-jre elasticsearch

echo ">> Java Installed"
echo ">> Elastic Search Installed"

echo ">> Scheduling Elasticsearch"
/bin/systemctl daemon-reload
/bin/systemctl enable elasticsearch.service

echo ">> Starting Elasticsearch"
systemctl start elasticsearch.service

echo ">> Running on port 9200. Make sure to add a firewall rule if you need external access."
echo ">> You can check the status by running 'curl 'http://localhost:9200'. Note: may take a few seconds before elasticsearch is fully started."

型

配方报告

>> Installing Elastic GPG Key
Warning: apt-key output should not be parsed (stdout is not a terminal)
OK
>> Install apt-transport-https

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Reading package lists...
Building dependency tree...
Reading state information...
apt-transport-https is already the newest version (1.6.10).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
>> Adding deb package
deb https://artifacts.elastic.co/packages/6.x/apt stable main
>> Updating apt

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

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Fetched 32.8 MB in 8s (4196 kB/s)
Reading package lists...
Building dependency tree...
Reading state information...
7 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
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W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
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W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
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W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
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W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
>> Installing Java and Elastic Search

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Reading package lists...
Building dependency tree...
Reading state information...
default-jre is already the newest version (2:1.11-68ubuntu1~18.04.1).
The following NEW packages will be installed:
  elasticsearch
0 upgraded, 1 newly installed, 0 to remove and 7 not upgraded.
Need to get 347 MB of archives.
After this operation, 572 MB of additional disk space will be used.
Get:1 https://artifacts.elastic.co/packages/7.x/apt stable/main amd64 elasticsearch amd64 7.1.0 [347 MB]
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to frontend: Teletype
dpkg-preconfigure: unable to re-open stdin: 
Fetched 347 MB in 6s (57.1 MB/s)
Selecting previously unselected package elasticsearch.
(Reading database ... 
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(Reading database ... 91269 files and directories currently installed.)
Preparing to unpack .../elasticsearch_7.1.0_amd64.deb ...
Creating elasticsearch group... OK
Creating elasticsearch user... OK
Unpacking elasticsearch (7.1.0) ...
Processing triggers for ureadahead (0.100.0-21) ...
Setting up elasticsearch (7.1.0) ...
Created elasticsearch keystore in /etc/elasticsearch
Processing triggers for systemd (237-3ubuntu10.21) ...
Processing triggers for ureadahead (0.100.0-21) ...
>> Java Installed
>> Elastic Search Installed
>> Scheduling Elasticsearch
Synchronizing state of elasticsearch.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable elasticsearch
Created symlink /etc/systemd/system/multi-user.target.wants/elasticsearch.service → /usr/lib/systemd/system/elasticsearch.service.
>> Starting Elasticsearch
>> Running on port 9200. Make sure to add a firewall rule if you need external access.
>> You can check the status by running 'curl 'http://localhost:9200'. Note: may take a few seconds before elasticsearch is fully started.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

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