Enable indexes_namespace_cache by default

ee/app/models/ee/application_setting.rb

@@ -156,7 +156,7 @@ module EE
       return false unless elasticsearch_indexing?
       return true unless elasticsearch_limit_indexing?
 
-      elasticsearch_limited_namespaces.exists?(namespace.id) unless ::Feature.enabled?(:elasticsearch_indexes_namespace_cache)
+      elasticsearch_limited_namespaces.exists?(namespace.id) unless ::Feature.enabled?(:elasticsearch_indexes_namespace_cache, default_enabled: true)
 
       ::Gitlab::Elastic::ElasticsearchEnabledCache.fetch(:namespace, namespace.id) do
         elasticsearch_limited_namespaces.exists?(namespace.id)

ee/changelogs/unreleased/244847-rollout-elasticsearch-indexes-namespace-cache.yml

+---
+title: Enable elasticsearch namespace enabled cache by default
+merge_request: 41875
+author:
+type: performance

ee/config/feature_flags/development/elasticsearch_indexes_namespace_cache.yml

@@ -4,4 +4,4 @@ introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41274
 rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/244847
 group: group::global search
 type: development
-default_enabled: false
+default_enabled: true