How to find the ID of the first custom record?

Hello,
How are you doing?
I am back .... with question.

How to find the minimum ID from a series of search criteria?

var searchFilters = new Array();
searchFilters[0] = new nlobjSearchFilter('internalid', null, 'is', 'ID', null);
searchFilters[1] = How shall I define this one? How to use the function min() in such case?
searchFilters[2] = new nlobjSearchFilter('internalid', null, 'is', 'custrecord_es_doc_status', null);
searchFilters[3] = new nlobjSearchFilter('custrecord_es_doc_status', null, 'is', '3', null);
searchFilters[4] = new nlobjSearchFilter('internalid', null, 'is', 'custrecord_es_sender_account', null);
searchFilters[5] = new nlobjSearchFilter('custrecord_es_sender_account', null, 'is', '1', null);
var searchresults = nlapiSearchRecord('customrecord_es_doc_hist', null, searchFilters, null);