Manage index schema (FAST Search Server 2010 for SharePoint)
Applies to: FAST Search Server 2010
The FAST Search Server 2010 for SharePoint index schema controls which managed properties are indexed, searchable, and available for viewing. The index schema Windows PowerShell cmdlets work with metadata extracted from content sources. Metadata can be structured content (such as the title or the author from a Word document), or unstructured content based on the content of an item (such as a detected language or extracted keywords).
When managing metadata, you work with crawled properties and managed properties:
Crawled properties are metadata extracted from content sources when you run a crawler or connector.
Managed properties are a subset of crawled properties that are searchable. To make metadata searchable, you map one or more crawled properties to a managed property. You can also create a full-text index and map the content of a managed property into the full-text index.
Query refinement uses aggregated statistical data, such as the distribution of managed property values in query results, to filter results. It is typically applied to item metadata - such as creation date, author, and person names - appearing in the item. For example, users can refine queries to items created in a certain time period, or to items referencing a specific person. For numeric properties, refiners provide drill down options in the form of refinement bins, where each bin represents a set of values in the statistical distribution.
FAST Search Server 2010 for SharePoint supports two kinds of query refiners:
Deep refiners: Query refinement is based on the aggregation of managed property statistics for all of the results of a search query.
Shallow refiners: Query refinement is based on the aggregation of managed property statistics for the top 50 results for a search.
Refinement data is created during results processing.
This section describes how to manage properties by using Windows PowerShell. For information about how to work with managed and crawled properties by using the graphical user interface, see Property Management (Office.com).
For details about the index schema object model and important index schema properties, see Index Schema (MSDN)
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