I’ve before, now it’s official. If you have not seen this before, you can find the following in the for 6.5:

The Sitecore.Data.Indexing namespace has been deprecated and will be removed in a future version of the CMS in favor of the more powerful and flexible Sitecore.Search classes and corresponding index definitions.

Now it’s a good time to revisit the functionality build on top of “old” search and re-implement it with Sitecore.Search namespace.

Related documentation: