N/search Module
Filter.summary
Property Description: Summary type for the search filter. Use this property to get or set the value of the summary type. See search.Summary.
Type: search.Summary
Supported Script Types: All script types For more information, see SuiteScript 2.0 Script Types.
Module: N/search Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Filter.summary

// Code Example 1

//Add additional code

//...

var mySearchFilter = search.createFilter({

    name: 'entity',

    operator: search.Operator.ISNOTEMPTY,

    summary: search.Summary.GROUP

});

//...



//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_46485229492.html