Full-Text Index

* You can group multiple managed properties into a full-text index.

* This enables you to query across several managed properties at the same time.

* Full-text indexes enable you to dynamically rank queries (results sorted by relevancy).

A full-text index typically contains a set of managed properties that represents the content of the item that you are querying. This includes the body of the item, the title, the URL, and so on. You can define multiple full-text indexes for different kinds of queries or different applications.

To achieve ranked queries, you associate the full-text index with one or more rank profiles.

A default index schema configuration contains one full-text index named content. This is the default full-text index for queries without any property filter.

Note:
Do not delete and re-create a full-text index with the same name but a different configuration. The re-created full-text index will at first contain all items that were indexed in this full-text index before deletion. The items that no longer belong in the full-text index will appear in query results until the items are updated or deleted.

interfaces that are related to full-text indexes:

FullTextIndex Specifies a full-text index.
FullTextIndexCollection Enables access to an existing full-text index. You use the FullTextIndexCollection.Create method to create a new full-text index.
ManagedProperty Managed properties are metadata that can be searched or retrieved in query results.
You can map one or more managed properties to the full-text index by using the ManagedProperty.GetFullTextIndexMappings method.
RankProfile You use a rank profile to specify how to perform relevance ranking of query results.
You can associate one or more full-text indexes to a rank profile by using the RankProfile.GetFullTextIndexRanks method.
FullTextIndexMapping You use this interface to map one managed property to the full-text index.
You manage the mapping by using the ManagedProperty.GetFullTextIndexMappings method.
FullTextIndexRankComponent Configures proximity boost and context boost weight parameters that are associated with a given full-text index for a rank profile.
You manage the mapping by using the RankProfile.GetFullTextIndexRanks method.
For more information about context boost, see Importance Level and Drilling.

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