Remove elastic_index_use_trigger_indexing FF

Terri Churequested to merge
434580-remove-elastic_index_use_trigger_indexing-ff into master

What does this MR do and why?

Related to #434580 (closed) which was default enabled in !155730 (merged) (%17.1)

This MR removes the elastic_index_use_trigger_indexing feature flag and updates documentation

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

N/A

How to set up and validate locally

  1. enable elasticsearch for gdk
  2. run the gitlab:elastic:index rake task and verify the worker is used
➜ bundle exec rake gitlab:elastic:index
Scheduling indexing with TriggerIndexingWorker
Scheduling indexing with TriggerIndexingWorker... done
Edited by Terri Chu

Merge request reports