Indexing or reindexing search after the upgrade
After your upgrade, (re)indexing of the search index is required.
About this task
If you are upgrading from SDL Tridion 2009 SP1, note that the new Lucene-based search engine may return different search results to your search queries than the old Verity search engine it replaces. Specifically, operator precedence (in search queries such as a AND b OR c) is different. You can work around the problem by using brackets to indicate precedence.