Make elasticsearch check more thorough

So that allowed scopes are not overridden when
limit_indexing is on

ee/app/services/ee/search/global_service.rb

@@ -42,9 +42,11 @@ module EE
 
       override :allowed_scopes
       def allowed_scopes
+        return super unless use_elasticsearch?
+
         strong_memoize(:ee_allowed_scopes) do
           super.tap do |ce_scopes|
-            ce_scopes.concat(%w[notes wiki_blobs blobs commits]) if ::Gitlab::CurrentSettings.elasticsearch_search?
+            ce_scopes.concat(%w[notes wiki_blobs blobs commits])
           end
         end
       end

ee/changelogs/unreleased/217158-nomethoderror-undefined-method-without_count-for-kaminari-pagin.yml

+---
+title: Fix 500 errors caused by globally searching for scopes which cannot be used without
+  Elasticsearch
+merge_request: 31508
+author:
+type: fixed

ee/spec/services/search/global_service_spec.rb

@@ -169,4 +169,22 @@ describe Search::GlobalService do
       end
     end
   end
+
+  describe '#allowed_scopes' do
+    context 'when ES is used' do
+      it 'includes ES-specific scopes' do
+        expect(described_class.new(user, {}).allowed_scopes).to include('commits')
+      end
+    end
+
+    context 'when ES is not used' do
+      before do
+        stub_ee_application_setting(elasticsearch_limit_indexing: true)
+      end
+
+      it 'does not include ES-specific scopes' do
+        expect(described_class.new(user, {}).allowed_scopes).not_to include('commits')
+      end
+    end
+  end
 end