Starting from version 5.0, VisualSVN Server supports full-text search for your repositories. However, search indexing must be enabled on the server for the search to be available.
If search indexing is disabled in the server settings, the following message appears when you try to perform a search in the web interface:
Search indexing disabled on the server
The search indexing should be enabled by your system administrator.
Information for the administrator
The detailed instructions are available in the KB178: Getting started with full-text search article.