Hide elasticsearch namespaces and projects when too many

As part of our rollout for
https://gitlab.com/gitlab-org/gitlab/issues/33681 we will end up having
thousands of namespaces in the rollout and this admin UI would break so
it's safest to hide it.

ee/app/helpers/ee/application_settings_helper.rb

@@ -55,6 +55,18 @@ module EE
       objects.map { |g| { id: g.id, text: g.full_name } }
     end
 
+    # The admin UI cannot handle so many namespaces so we just hide it. We
+    # assume people doing this are using automation anyway.
+    def elasticsearch_too_many_namespaces?
+      ElasticsearchIndexedNamespace.count > 50
+    end
+
+    # The admin UI cannot handle so many projects so we just hide it. We
+    # assume people doing this are using automation anyway.
+    def elasticsearch_too_many_projects?
+      ElasticsearchIndexedProject.count > 50
+    end
+
     def elasticsearch_namespace_ids
       ElasticsearchIndexedNamespace.target_ids.join(',')
     end

ee/app/views/admin/application_settings/_elasticsearch_form.html.haml

@@ -67,11 +67,17 @@
 
           .form-group.js-limit-namespaces{ class: ('hidden' unless @application_setting.elasticsearch_limit_indexing) }
             = f.label :elasticsearch_namespace_ids, _('Namespaces to index'), class: 'label-bold'
-            = f.text_field :elasticsearch_namespace_ids, class: 'js-elasticsearch-namespaces', value: elasticsearch_namespace_ids, data: { selected: elasticsearch_objects_options(@application_setting.elasticsearch_limited_namespaces(true)).to_json }
+            - if elasticsearch_too_many_namespaces?
+              %p= _('Too many namespaces enabled. You will need to manage them via the console or the API.')
+            - else
+              = f.text_field :elasticsearch_namespace_ids, class: 'js-elasticsearch-namespaces', value: elasticsearch_namespace_ids, data: { selected: elasticsearch_objects_options(@application_setting.elasticsearch_limited_namespaces(true)).to_json }
 
           .form-group.js-limit-projects{ class: ('hidden' unless @application_setting.elasticsearch_limit_indexing) }
             = f.label :elasticsearch_project_ids, _('Projects to index'), class: 'label-bold'
-            = f.text_field :elasticsearch_project_ids, class: 'js-elasticsearch-projects', value: elasticsearch_project_ids, data: { selected: elasticsearch_objects_options(@application_setting.elasticsearch_limited_projects(true)).to_json }
+            - if elasticsearch_too_many_projects?
+              %p= _('Too many projects enabled. You will need to manage them via the console or the API.')
+            - else
+              = f.text_field :elasticsearch_project_ids, class: 'js-elasticsearch-projects', value: elasticsearch_project_ids, data: { selected: elasticsearch_objects_options(@application_setting.elasticsearch_limited_projects(true)).to_json }
 
         .sub-section
           %h4= _('Elasticsearch AWS IAM credentials')

ee/changelogs/unreleased/33681-handle-too-many-elasticsearch-rollout.yml

+---
+title: Hide elasticsearch namespaces and projects when too many in rollout
+merge_request: 21225
+author:
+type: changed

ee/spec/views/admin/application_settings/_elasticsearch_form.html.haml_spec.rb

@@ -31,4 +31,56 @@ describe 'admin/application_settings/_elasticsearch_form' do
       expect(page.find_field('Enter new AWS Secret Access Key').value).to be_blank
     end
   end
+
+  context 'when there are elasticsearch indexed namespaces' do
+    let(:application_setting) { build(:application_setting, elasticsearch_limit_indexing: true) }
+
+    before do
+      create(:elasticsearch_indexed_namespace)
+      create(:elasticsearch_indexed_namespace)
+      create(:elasticsearch_indexed_namespace)
+    end
+
+    it 'shows the input' do
+      render
+      expect(rendered).to have_field('application_setting[elasticsearch_namespace_ids]')
+    end
+
+    context 'when there are too many elasticsearch indexed namespaces' do
+      before do
+        create_list :elasticsearch_indexed_namespace, 60
+      end
+
+      it 'hides the input' do
+        render
+        expect(rendered).not_to have_field('application_setting[elasticsearch_namespace_ids]')
+      end
+    end
+  end
+
+  context 'when there are elasticsearch indexed projects' do
+    let(:application_setting) { build(:application_setting, elasticsearch_limit_indexing: true) }
+
+    before do
+      create(:elasticsearch_indexed_project)
+      create(:elasticsearch_indexed_project)
+      create(:elasticsearch_indexed_project)
+    end
+
+    it 'shows the input' do
+      render
+      expect(rendered).to have_field('application_setting[elasticsearch_project_ids]')
+    end
+
+    context 'when there are too many elasticsearch indexed projects' do
+      before do
+        create_list :elasticsearch_indexed_project, 60
+      end
+
+      it 'hides the input' do
+        render
+        expect(rendered).not_to have_field('application_setting[elasticsearch_project_ids]')
+      end
+    end
+  end
 end

locale/gitlab.pot

@@ -18660,6 +18660,12 @@ msgstr ""
 msgid "Too many changes to show."
 msgstr ""
 
+msgid "Too many namespaces enabled. You will need to manage them via the console or the API."
+msgstr ""
+
+msgid "Too many projects enabled. You will need to manage them via the console or the API."
+msgstr ""
+
 msgid "Topics"
 msgstr ""