How to update a single item in a Sitecore index?

Question

In my Sitecore content tree there are few thousands of items, and I just want to alter few items programmatically. Instead of rebuilding the entire lucene index which is taking a big time, I want to update index entries for each item I'm altering in real time. I tried

item.Database.Indexes.UpdateItem(item);

but it is obsolete and ask me to use SearchManager .

Can anyone guide me how to update index entries for a given item?

PS: I'm altering items from desktop application, not the website.

Answer 1

Try to execute one of the HistoryEngine.RegisterItem... methods, eg:

item.Database.Engines.HistoryEngine.RegisterItemSaved(item, new ItemChanges(item));
item.Database.Engines.HistoryEngine.RegisterItemCreated(item);
item.Database.Engines.HistoryEngine.RegisterItemMoved(item, oldParentId);

Answer 2

实际上索引上没有Update操作，所以随意做删除/添加