require(['N/search'], function(search) {
    
    var invoiceLineSearchResults = [];
    
    var invoiceLineSearch = search.create({
        type: search.Type.INVOICE,
        filters: [
            {name: 'internalid', operator: search.Operator.ANYOF, values: ['34094']},
            {name: 'mainline', operator: search.Operator.IS, values: 'F'}
        ],
        columns: ['item']
    });
    
    var invoiceLineSearchResultSet = invoiceLineSearch.run();
    
    invoiceLineSearchResultSet.each(function (result) {
        invoiceLineSearchResults.push(result);
        console.log('item: ' + result.getValue({name: 'item'}));
    });
    
    console.log('invoiceLineSearchResults: ' + JSON.stringify(invoiceLineSearchResults));
    console.log('invoiceLineSearchResults.length: ' + invoiceLineSearchResults.length);
});