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Switch issue.title to a new analyzer

Ravi Kumar requested to merge 439089-switch-issue-title-to-code_analyzer into master

What does this MR do and why?

This MR creates a new analyzer title_analyzer and adds it to the title in the issues index. There is migration ReindexIssueToUpdateAnalyzerForTitle which uses Zero downtime reindexing to reindex all the issues to fix the analyzer for the title

MR acceptance checklist

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Before After

How to set up and validate locally

  • Make sure Elastic search is enabled

On the master branch:

  • Create an Issue with a title dots.also.need.testing
  • Make sure this new issue is available on Elasticsearch. You might need to wait a bit or sometimes restart the rails-background-jobs
  • Now perform a project search under the issue's project with the keyword also.need
  • You won't find the created issue in the search results
  • Repeat the process for the following table and you should not see the result.
Title of the issue Search Query
köln koln
koln_berlin koln
kolnBerlin koln

Now switch to the MR branch

  • Run the bundle exec rake gitlab:elastic:index to reindex the issues with the new analyzer
  • Make sure this new issue is available on Elasticsearch. You might need to wait a bit or sometimes restart the rails-background-jobs
  • Now perform a project search under the issue's project with the keyword also.need
  • You will find the created issue in the search results
  • Repeat the process for the following table and you should see the result.
Title of the issue Search Query
köln koln
koln_berlin koln
kolnBerlin koln

Migration run time

~36 minutes

Related to #439089 (closed)

Edited by Ravi Kumar

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