Log when missing project_feature during project index

Add logging to help identify why projects are missing
project_feature attributes when a validation rule
exists. This data generates errors during indexing.

ee/changelogs/unreleased/232654-nomethoderror-undefined-method-issues_access_level-for-nil-nilc.yml

+---
+title: Add logging when indexing projects are missing project_feature attribute
+merge_request: 39255
+author:
+type: fixed

ee/lib/elastic/latest/project_instance_proxy.rb

@@ -39,8 +39,14 @@ module Elastic
         # ES6 is now single-type per index, so we implement our own typing
         data['type'] = 'project'
 
+        # Somehow projects are being created and sent for indexing without an associated project_feature
+        # https://gitlab.com/gitlab-org/gitlab/-/issues/232654
+        # When this happens, log the errors to help with debugging, and raise the error to prevent indexing bad data
         TRACKED_FEATURE_SETTINGS.each do |feature|
           data[feature] = target.project_feature.public_send(feature) # rubocop:disable GitlabSecurity/PublicSend
+        rescue NoMethodError => err
+          target.logger.error("Elasticsearch failed to read feature #{feature} for #{target.class} #{target.id}: #{err}")
+          raise
         end
 
         data

ee/spec/lib/elastic/latest/project_instance_proxy_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Elastic::Latest::ProjectInstanceProxy do
+  let(:project) { create(:project) }
+
+  subject { described_class.new(project) }
+
+  describe '#as_indexed_json' do
+    it 'serializes project as hash' do
+      result = subject.as_indexed_json.with_indifferent_access
+
+      expect(result).to include(
+        id: project.id,
+        name: project.name,
+        path: project.path,
+        description: project.description,
+        namespace_id: project.namespace_id,
+        created_at: project.created_at,
+        updated_at: project.updated_at,
+        archived: project.archived,
+        visibility_level: project.visibility_level,
+        last_activity_at: project.last_activity_at,
+        name_with_namespace: project.name_with_namespace,
+        path_with_namespace: project.path_with_namespace)
+
+      Elastic::Latest::ProjectInstanceProxy::TRACKED_FEATURE_SETTINGS.each do |feature|
+        expect(result).to include(feature => project.project_feature.public_send(feature)) # rubocop:disable GitlabSecurity/PublicSend
+      end
+    end
+
+    it 'raises an error for a project with an empty project_feature' do
+      allow(project).to receive(:project_feature).and_return(nil)
+
+      expect(project.logger).to receive(:error)
+      expect { subject.as_indexed_json }.to raise_error NoMethodError
+    end
+  end
+end