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Advanced Search: Add meta field to indices mapping

Dmitry Gruzd requested to merge 349124-add-meta-field-to-indices-mappings into master

What does this MR do and why?

This MR adds _meta field to every Elasticsearch index for debugging purposes. As the first iteration we'll add Gitlab::VERSION of the installation that created these indices.

#349124 (closed)

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How to set up and validate locally

  1. Enable Advanced Search if it's not configured
  2. Checkout the branch of this MR
  3. Create an empty index by running: 
    Gitlab::Elastic::Helper.default.create_empty_index(with_alias: false)
  4. Note the index name which looks like gitlab-development-20211222-1716 and execute the command using it as a path. For example: 
    $ curl -s http://localhost:9200/gitlab-development-20211222-1716/_mappings | jq ".[].mappings._meta"
{
 "created_by": "14.7.0-pre"
}
  5. Ensure that it outputs current GitLab version
  6. Delete the newly created index by running: 
    curl -XDELETE http://localhost:9200/gitlab-development-20211222-1716

MR acceptance checklist

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

Closes #349124 (closed)

Edited by Dmitry Gruzd

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