Channel index fix (#22947)

* WIP

* Fetched ES index for type checking

* WIP

* Moved migration key to model

* CI

* CI

* Fixed existing tests

* Updated einterface mocks

* CI

* WIP

* Reverted test makefile changes

* Fixed error level

* CI

* Not attempting to launch job if not enterprise ready

* CI

* Fixing job trigger condition

* CI

* Updated eemocks

* CI

server/channels/app/migrations.go

@@ -559,6 +559,24 @@ func (s *Server) doPostPriorityConfigDefaultTrueMigration() {
 	}
 }
 
+func (s *Server) doElasticsearchFixChannelIndex() {
+	// If the migration is already marked as completed, don't do it again.
+	if _, err := s.Store().System().GetByName(model.MigrationKeyElasticsearchFixChannelIndex); err == nil {
+		return
+	}
+
+	license := s.License()
+	if model.BuildEnterpriseReady != "true" || license == nil || !*license.Features.Elasticsearch {
+		mlog.Info("Skipping triggering Elasticsearch channel index fix job as build is not Enterprise ready")
+		return
+	}
+
+	if _, appErr := s.Jobs.CreateJob(model.JobTypeElasticsearchFixChannelIndex, nil); appErr != nil {
+		mlog.Fatal("failed to start job for fixing Elasticsearch channels index", mlog.Err(appErr))
+		return
+	}
+}
+
 func (a *App) DoAppMigrations() {
 	a.Srv().doAppMigrations()
 }
@@ -580,4 +598,5 @@ func (s *Server) doAppMigrations() {
 	s.doFirstAdminSetupCompleteMigration()
 	s.doRemainingSchemaMigrations()
 	s.doPostPriorityConfigDefaultTrueMigration()
+	s.doElasticsearchFixChannelIndex()
 }