SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/for-developers-recalculate-the-metadata-of-control-properties

RecalculateMetadata.cs

using System;
using Telerik.Sitefinity.Modules.Pages;
using Telerik.Sitefinity.Scheduling;

namespace SitefinityWebApp
{
    public class RecalculateMetadata
    {
        public void RecalculateMetadataOfControlProperties()
        {
            var task = new FixControlPropertiesTask();
            task.WorkMode = FixControlPropertiesTask.Mode.FlagsOnly;
            task.Id = Guid.NewGuid();

            var manager = SchedulingManager.GetManager();
            manager.AddTask(task);
            manager.SaveChanges();
        }
    }
}