This table simply maps the Search Service name to a string defining the mapper type. The default is the standard event mapper, which does not need to be specified. To use the pull mapper with a particular search service, a row should be added to this table mapping the Search Service name to the mapper type "PULL".
The Search Service Identifier; a string used to uniquely identify a Search Service. This is a foreign key of the SearchService table.
Set this to 'PULL' (must be uppercase) to enable the Pull Mapper for the search service.