How to change replica for system indices

Elastic Stack Elasticsearch
1

Hi all,
I wanted to change the number of replicas for Elasticsearch system indices.
I know that the forbit it but is there a way to override that to increase the number of indices or replicas for elastic system indices.

Thanks for your time.

2

What version are you running?
Most newer versions will use auto-expanding replicas (from 0 to 1).

3

i'am currently use version 8.1, so where can i find that auto-expanding replicas on elastic?

4

It's part of the template for the index. Why do you want to change it?

5

I want to increase the number of replicas of the system indices to make sure that if the server that host the system indices die then i can still operate on elastic to fix the issue.
Since there is only 1 replicas on the system indices so it is alittle scary for important indices to only have 1 replicas.

1 Like
6

wait you mean i can change the index template for system indices?

7

Oh but what i want is to change the current system indices number of replicas and not the template one.

8

I also want to change its replica count to 3. Although it is not recommended to modify system indices manually, I am afraid to have down time.

As I know, I can increase the replica count of each sistem indices along with all other indexes by using Dev Tools like

PUT /*/_settings
{
  "index" : {
    "number_of_replicas" : 3,  
    "auto_expand_replicas" : "0-3"
  }
}

But this is just for existing system indices, I think I need to create some index template for system indices to apply the same settings.

So can you help me

  1. how I can do that
  2. What are the system indices/ system indices template
  3. What is the best practice to satisfy the resilience in terms of system indices

Best Regards,
Kursad

9

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