Fix N+1 queries for issues search

app/models/issue.rb

@@ -114,7 +114,7 @@ class Issue < ApplicationRecord
   scope :order_severity_desc, -> { includes(:issuable_severity).order('issuable_severities.severity DESC NULLS LAST') }
 
   scope :preload_associated_models, -> { preload(:assignees, :labels, project: :namespace) }
-  scope :with_web_entity_associations, -> { preload(:author, :project) }
+  scope :with_web_entity_associations, -> { preload(:author, project: [:project_feature, :route, namespace: :route]) }
   scope :with_label_attributes, ->(label_attributes) { joins(:labels).where(labels: label_attributes) }
   scope :with_alert_management_alerts, -> { joins(:alert_management_alert) }
   scope :with_prometheus_alert_events, -> { joins(:issues_prometheus_alert_events) }

changelogs/unreleased/230712-fix-n-1-queries-for-issues-search.yml

+---
+title: Fix N+1 queries for issues search
+merge_request: 58915
+author:
+type: performance

ee/spec/features/search/elastic/global_search_spec.rb

@@ -45,9 +45,7 @@ RSpec.describe 'Global elastic search', :elastic, :sidekiq_inline do
       let(:object) { :issue }
       let(:creation_args) { { project: project, title: 'initial' } }
       let(:path) { search_path(search: 'initial', scope: 'issues') }
-      # N+1 queries still exist and will be fixed per
-      # https://gitlab.com/gitlab-org/gitlab/-/issues/230712
-      let(:query_count_multiplier) { 1 }
+      let(:query_count_multiplier) { 0 }
 
       it_behaves_like 'an efficient database result'
     end