Creates IUmbracoIndexer to decouple lucene from the indexers

src/Umbraco.Examine/IUmbracoIndexer.cs

@@ -0,0 +1,23 @@
+using Examine;
+
+namespace Umbraco.Examine
+{
+    /// <summary>
+    /// A Marker interface for defining an Umbraco indexer
+    /// </summary>
+    public interface IUmbracoIndexer : IIndexer
+    {
+        /// <summary>
+        /// When set to true Umbraco will keep the index in sync with Umbraco data automatically
+        /// </summary>
+        bool EnableDefaultEventHandler { get; }
+
+        /// <summary>
+        /// When set to true data will not be deleted from the index if the data is being unpublished (not deleted)
+        /// </summary>
+        /// <remarks>
+        /// Generally used only for published content
+        /// </remarks>
+        bool SupportUnpublishedContent { get; }
+    }
+}