Add enable and disable advanced search rake tasks

Changelog: added
EE: true

doc/integration/elasticsearch.md

@@ -478,6 +478,8 @@ The following are some available Rake tasks:
 | [`sudo gitlab-rake gitlab:elastic:mark_reindex_failed`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/tasks/gitlab/elastic.rake)              | Mark the most recent re-index job as failed. |
 | [`sudo gitlab-rake gitlab:elastic:list_pending_migrations`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/tasks/gitlab/elastic.rake)          | List pending migrations. Pending migrations include those that have not yet started, have started but not finished, and those that are halted. |
 | [`sudo gitlab-rake gitlab:elastic:estimate_cluster_size`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/tasks/gitlab/elastic.rake)            | Get an estimate of cluster size based on the total repository size. |
+| [`sudo gitlab-rake gitlab:elastic:enable_search_with_elasticsearch`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/tasks/gitlab/elastic.rake)            | Enable advanced search with Elasticsearch. |
+| [`sudo gitlab-rake gitlab:elastic:disable_search_with_elasticsearch`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/tasks/gitlab/elastic.rake)            | Disables advanced search with Elasticsearch. |
 
 ### Environment variables
 

ee/lib/tasks/gitlab/elastic.rake

@@ -27,6 +27,36 @@ namespace :gitlab do
       Rake::Task["gitlab:elastic:index_snippets"].invoke
     end
 
+    desc 'GitLab | Elasticsearch | Enable Elasticsearch search'
+    task enable_search_with_elasticsearch: :environment do
+      if Gitlab::CurrentSettings.elasticsearch_search?
+        puts "Setting `elasticsearch_search` was already enabled."
+      else
+        ApplicationSettings::UpdateService.new(
+          Gitlab::CurrentSettings.current_application_settings,
+          nil,
+          { elasticsearch_search: true }
+        ).execute
+
+        puts "Setting `elasticsearch_search` has been enabled."
+      end
+    end
+
+    desc 'GitLab | Elasticsearch | Disable Elasticsearch search'
+    task disable_search_with_elasticsearch: :environment do
+      if Gitlab::CurrentSettings.elasticsearch_search?
+        ApplicationSettings::UpdateService.new(
+          Gitlab::CurrentSettings.current_application_settings,
+          nil,
+          { elasticsearch_search: false }
+        ).execute
+
+        puts "Setting `elasticsearch_search` has been disabled."
+      else
+        puts "Setting `elasticsearch_search` was already disabled."
+      end
+    end
+
     desc "GitLab | Elasticsearch | Index projects in the background"
     task index_projects: :environment do
       print "Enqueuing projects…"

ee/spec/tasks/gitlab/elastic_rake_spec.rb

@@ -7,6 +7,54 @@ RSpec.describe 'gitlab:elastic namespace rake tasks', :elastic, :silence_stdout
     Rake.application.rake_require 'tasks/gitlab/elastic'
   end
 
+  describe 'when enabling and disabling elastic settings' do
+    let(:settings) { ::Gitlab::CurrentSettings }
+
+    before do
+      settings.update!(elasticsearch_search: es_enabled)
+    end
+
+    describe 'when enabling elasticsearch with setting initially off' do
+      subject { run_rake_task('gitlab:elastic:enable_search_with_elasticsearch') }
+
+      let(:es_enabled) { false }
+
+      it 'enables elasticsearch' do
+        expect { subject }.to change { settings.elasticsearch_search }.from(false).to(true)
+      end
+    end
+
+    describe 'when enabling elasticsearch with setting initially on' do
+      subject { run_rake_task('gitlab:elastic:enable_search_with_elasticsearch') }
+
+      let(:es_enabled) { true }
+
+      it 'does nothing when elasticsearch is already enabled' do
+        expect { subject }.not_to change { settings.elasticsearch_search }
+      end
+    end
+
+    describe 'when disabling elasticsearch with setting initially on' do
+      subject { run_rake_task('gitlab:elastic:disable_search_with_elasticsearch') }
+
+      let(:es_enabled) { true }
+
+      it 'disables elasticsearch' do
+        expect { subject }.to change { settings.elasticsearch_search }.from(true).to(false)
+      end
+    end
+
+    describe 'when disabling elasticsearch with setting initially off' do
+      subject { run_rake_task('gitlab:elastic:disable_search_with_elasticsearch') }
+
+      let(:es_enabled) { false }
+
+      it 'does nothing when elasticsearch is already disabled' do
+        expect { subject }.not_to change { settings.elasticsearch_search }
+      end
+    end
+  end
+
   describe 'create_empty_index' do
     subject { run_rake_task('gitlab:elastic:create_empty_index') }