[DS-3852] Give more information about the item just indexed, to help identify it in case of problems.

dspace-oai/src/main/java/org/dspace/xoai/app/XOAI.java

@@ -283,7 +283,8 @@ public class XOAI {
         doc.addField("item.compile", out.toString());
 
         if (verbose) {
-            println("Item with handle " + handle + " indexed");
+            println(String.format("Item %d with handle %s indexed",
+                    item.getID(), handle));
         }