Post OpenSearch migration: Remove ElasticSearch related content in our documents

[timckt]

Background

After we have migrated to OpenSearch and decommission the ElasticSearch, we need to check and update our document to remove the ElasticSearch related content in our documents.

The should be done after #5650 completed.

Proposed user journey

Approach

• Search through our documents, include but not limited to:

  • User guide
  • repo readme
  • runbook
  • else where

• Remove the ElasticSearch related content

Which part of the user docs does this impact

Communicate changes

• post for #cloud-platform-update
• Weeknotes item
• Show the Thing/P&A All Hands/User CoP
• Announcements channel

Questions / Assumptions

Definition of done

• readme has been updated
• user docs have been updated
• another team member has reviewed
• smoke tests are green
• prepare demo for the team

Reference

How to write good user stories

[sj-williams]

Some updates to runbooks have been carried out here:
https://github.com/ministryofjustice/cloud-platform/pull/6460/files

And some user-guide:
https://github.com/ministryofjustice/cloud-platform-user-guide/pull/1746/files

[sj-williams]

Some new tickets created to cover additional documentation checks and rewrites:

OpenSearch Documentation: Remove data from OpenSearch:
#6504

OpenSearch Documentation: Storage issues
#6503

OpenSearch Documentation: Export data to CSV
#6502

OpenSearch Documentation: Migrating a domain
#6501