Orchard/src/Orchard.Web/Modules/Orchard.Indexing/Services/IIndexService.cs

using System;
using System.Collections.Generic;

namespace Orchard.Indexing.Services {
    public class IndexEntry {
        public string IndexName { get; set; }
        public int DocumentCount { get; set; }
        public DateTime? LastUpdateUtc { get; set; }
        public IEnumerable<string> Fields { get; set; }
    }

    public interface IIndexingService : IDependency {
        void RebuildIndex();
        void UpdateIndex();
        IndexEntry GetIndexEntry();
    }
}