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Access the Full-Text Search view
You can To open the Full-Text Search view of the SQL Diagnostic Manager Services tab by selecting , select the appropriate SQL Server instance, and then clicking Services > click Services, and select Full-Text Search.
Optimize or Rebuild my Full-Text Catalog
Optimize
When you select the Optimize button, SQL Server optimizes the space utilization of the catalog and improve query performance as well as the accuracy of relevance rankings of search results.
Rebuild
When you select the Rebuild button, SQL Server repopulates the full-text search index.