Link Elasticsearch indexing progress to elastic_commit_indexer

This was previously linking to `elastic_full_index`. Looking at the size
of the `elastic_full_index` queue is much less valuable considering it
is ultimately just spinning up a bunch of `elastic_commit_indexer` jobs
which do all the heavy lifting and it's very likely the
`elastic_full_index` queue is drained in seconds (since there is no back
pressure) while the `elastic_commit_indexer` queue takes days to finish
draining.

There are also other queues at play which are indexing non-code
documents (eg. issues) but from experience these are drained quicker
than the `elastic_commit_indexer` queue when indexing projects so if we
had to pick one queue then `elastic_commit_indexer` is the best one to
show.

We could consider something more sophisticated in future but I wanted to
correct this for now since the `elastic_full_index` queue is not a
useful way to track progress.

ee/app/controllers/admin/elasticsearch_controller.rb

@@ -8,7 +8,7 @@ class Admin::ElasticsearchController < Admin::ApplicationController
       ::Elastic::IndexProjectsService.new.execute
 
       notice = _('Elasticsearch indexing started')
-      queue_link = helpers.link_to(_('(check progress)'), sidekiq_path + '/queues/elastic_full_index')
+      queue_link = helpers.link_to(_('(check progress)'), sidekiq_path + '/queues/elastic_commit_indexer')
       flash[:notice] = "#{notice} #{queue_link}".html_safe
     else
       flash[:warning] = _('Please create an index before enabling indexing')

ee/changelogs/unreleased/link-elastic-progress-to-elastic-commit-indexer-instead.yml

+---
+title: Link Elasticsearch indexing progress to elastic_commit_indexer
+merge_request: 40928
+author:
+type: changed

ee/spec/controllers/admin/elasticsearch_controller_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe Admin::ElasticsearchController do
 
       post :enqueue_index
 
-      expect(controller).to set_flash[:notice].to include('/admin/sidekiq/queues/elastic_full_index')
+      expect(controller).to set_flash[:notice].to include('/admin/sidekiq/queues/elastic_commit_indexer')
       expect(response).to redirect_to general_admin_application_settings_path(anchor: 'js-elasticsearch-settings')
     end