Add refresh_interval to gitlab:elastic:info

What does this MR do and why?

This MR adds refresh_interval to the gitlab:elastic:info rake task output

Screenshots or screen recordings

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$ bin/rails gitlab:elastic:info

Advanced Search
Server version:                 8.6.2
Server distribution:            elasticsearch
Indexing enabled:               yes
Search enabled:                 yes
Requeue Indexing workers:       yes
Pause indexing:                 no
Indexing restrictions enabled:  no
File size limit:                1024 KiB
Indexing number of shards:      16

Indexing Queues
Initial queue:                  0
Incremental queue:              0

Indices
- gitlab-development-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
  refresh_interval: 2s
- gitlab-development-commits-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-epics-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-issues-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-merge_requests-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-notes-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-projects-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-users-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0
- gitlab-development-wikis-20230927-0920:
  number_of_shards: 1
  number_of_replicas: 0

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Execute

  curl -H 'Content-type: application/json' -XPUT 'http://localhost:9200/gitlab-development/_settings' -d '{
 "index": {
  "refresh_interval": "2s"
 }
}'

2. Run bin/rails gitlab:elastic:info
3. Verify that it shows refresh_interval: 2s for gitlab-development

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.