Enables one or more custom entity extractors to be associated with this managed property. This enables the system to extract ...

Enables one or more custom entity extractors to be associated with this managed property. This enables the system to extract entities from the managed property when crawling new or updated items. Afterwards, the extracted entities can be used to set up refiners in the web part. There are four types of custom extraction dictionaries. You create your own, separate custom entity extraction dictionaries that you deploy using the PowerShell cmdlet Import-SPEnterpriseSearchCustomExtractionDictionary.The system saves the original managed property content unchanged in the index and, in addition, copies the extracted entities to the managed properties  "WordCustomRefiner1" through 5, "WordPartCustomRefiner1" through 5, "WordExactCustomRefiner" and/or "WordPartExactCustomRefiner" respectively. These managed properties are configured to be searchable, queryable, retrievable, sortable and refinable.