N/search Module
search.createFilter()
Method Description: Creates a new search filter as a search.Filter object. You cannot directly create a filter or column for a list/record type field in SuiteScript by passing in its text value. You must use the field’s internal ID. If you must use the field’s text value, you can create a filter or column with a formula using name: 'formulatext'.
Returns: search.Filter
Supported Script Types: All script types For more information, see SuiteScript 2.0 Script Types.
Governance: None
Module: N/search Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=search.createFilter(options)

// Code Example 1

// Add additional code

//...

// Create a filter joined to another record type. When you create a joined filter:

// - The name property is the field ID of the field in the joined record that you are filtering on

// - The join property is the field ID of the field in the current record that contains the record

//   type you want to join to

// - The operator property is the operator to use to filter the results

// - The values property contains the values to use to filter the results

//

// For example, the following search definition lists the first 100 employees found

// who have a custom role. The search definition specifies that the search applies to

// Employee records. The filter definition joins the Role record type to the search

// and returns results where the iscustom field (a field on the Role record) is true.

var result = search.create({

    type: 'employee',

    columns: ['firstname', 'lastname', 'role'],

    filters: [

        search.createFilter({

            name: 'iscustom',

            join: 'role',

            operator: search.Operator.IS,

            values: true

        })

    ]

}).run().getRange({

    start: 0,

    end: 100

});

log.debug({

    title: 'Result',

    details: result

});

//...

// Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4345777107.html