Magento - How to change server Elasticsearch version?

Alexglvr
April 18, 2024
175 views
1 vote
2 Answers

I have Magento CE 2.4.6 running on a Ubuntu server with Elasticsearch 8.11.4. For a mandatory module I absolutely need, I need to downgrade to ES 7.9.3.

I read everywhere it was not possible to downgrade ES. Is there a way to uninstall ES 8.4.11 and install ES 7.9.3 without damaging the system? If yes, how?

(I don’t want to make any mistakes)

Tags: elasticsearch magento2

Answers

- TudorIftimie
- March 22, 2024 at 11:59 am
- 0 votes
0
The upgrade from 7.x to 8.x creates changes in indices and configurations that are not easy revesible.
Suggestion: build a test 7.x cluster and add the snapshot repositroy from 8.x as READ-ONLY. Import your indices one by one and test to see if you can still use them or what changes are necessary so you can revert them to 7.x . Once you tested all of them and you know it is doable, make a prod cluster and migrate all closed indices . Then test your integrations and plan a rupture day. You can migrate services one by one to minimize data loss or make a planed downtime .
You also need to read all the breaking changes inbetween your versions

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- Severalnines
- April 18, 2024 at 11:30 am
- 0 votes
0
As what @TudorIftimie have said, it is indeed impossible for you to downgrade. Consider using the snapshot backup and restore. Here’s an example of what you might come up with,
```
POST _snapshot/my_7_17_6_repo/mybackup-snapshot-miniforce-only/_restore?wait_for_completion=true&pretty=true
```
and the output is:
```
{
  "error" : {
    "root_cause" : [
      {
        "type" : "snapshot_restore_exception",
        "reason" : "[my_7_17_6_repo:mybackup-snapshot-miniforce-only/B46Pe8_RRy6MjAi75pl-iQ] the snapshot was created with Elasticsearch version [8.1.3] which is higher than the version of this node [7.17.3]"
      }
    ],
    "type" : "snapshot_restore_exception",
    "reason" : "[my_7_17_6_repo:mybackup-snapshot-miniforce-only/B46Pe8_RRy6MjAi75pl-iQ] the snapshot was created with Elasticsearch version [8.1.3] which is higher than the version of this node [7.17.3]"
  },
  "status" : 500
}
 
```
Due to that constraint, I suggest you use the Elasticdump. This provides you convenience to migrate or dump your indices from a higher version to a lower version. To do that, just use the following approach:

Specific only to Ubuntu which I tested this
```
apt install nodejs
apt install npm
npm install elasticdump
```
In my cluster which has 8.1.3, I have the following indices called the_mini_force. Now, I wanted to dump this to 7.17.6 version, I imply run:

Migrate the data mapping
```
NODE_TLS_REJECT_UNAUTHORIZED=0  ./elasticdump --input-cert /etc/elasticsearch-ca-8.1.3.pem --input=https://elastic:[email protected]:9200/the_mini_force --output-cert /etc/elasticsearch-ca-7.17.pem --output=https://elastic:[email protected]:9200/the_mini_force --type=mapping
```
Migrate the actual data
```
NODE_TLS_REJECT_UNAUTHORIZED=0  ./elasticdump --input-cert /etc/elasticsearch-ca-8.1.3.pem --input=https://elastic:[email protected]:9200/the_mini_force --output-cert /etc/elasticsearch-ca-7.17.pem --output=https://elastic:[email protected]:9200/the_mini_force --type=data
```
To explain further, my test shows you a cluster with a SSL certificate. Since I have just only a self-signed cert, you need to add NODE_TLS_REJECT_UNAUTHORIZED=0 if that is your case. Otherwise, you can just ignore that. Also you can see I supplied the cert location for both different version clusters. Which basically 192.168.40.141:9200 run on 8.1.3, and 192.168.40.146:9200 runs on 7.17.6.

This allows me to migrate data efficiently from higher version going to lower version. In fact, you can also do this vice-versa if you want to migrate from lower version to higher version as well and it works.

I suggest you try and test this. On my end, I use ClusterControl to allow me to test efficiently on Elasticsearch 8.1.3 version and Elasticsearch 7.17.6 version if that helps you test with speed. Good luck!
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