Understanding Search Categories
Search categories are essential for Search Framework. Search categories:
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Organize search definitions into manageable, logical groups of data.
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Are required for searches. Search queries run only against search categories, not search definitions. A search definition must be a member of a search category before it can be searched.
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Enable users to focus searches to help refine results and restrict searches to a particular set of search indexes. For example, users can run searches against categories like Customers, Purchase Orders, or Products, rather than running a search against all indexes in the search engine.
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Allow users to search across several different groups of data simultaneously. For example if you were looking for a particular Item ID, with a Search category containing multiple Search Definitions, you can search across purchase order, sales orders and inventory at one time.
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Provide improved search performance and results by limiting the number of indexes searched.
Note:
Search queries cannot be run directly against search definitions. Search queries can only be run against search categories.