func (r *ElasticsearchReconciler) Reconcile(ctx context.Context, request ctrl.Request) (ctrl.Result, error) {
        // Fetch the Elasticsearch instance
        cluster := &loggingv1.Elasticsearch{}

        err := r.Get(ctx, request.NamespacedName, cluster)
        if err != nil {
                if apierrors.IsNotFound(err) {
                        log.Info("Flushing nodes", "objectKey", request.NamespacedName)
                        elasticsearch.FlushNodes(request.NamespacedName.Name, request.NamespacedName.Namespace)
                        elasticsearch.RemoveDashboardConfigMap(r.Client)
                        if err := console.DeleteKibanaConsoleLink(context.TODO(), r.Client); err != nil {
                                log.Error(err, "failed to delete consolelink")
                        }
                        return ctrl.Result{}, nil


And elasticsearch.RemoveDashboardConfigMap(r.Client) is doing this:

// RemoveDashboardConfigMap removes the config map in the grafana dashboard
func RemoveDashboardConfigMap(c client.Client) {