$('input').selectize({
	plugins: ['delayed_select'],

    load: function(query, callback) {
        if (query.length < 2) return callback();
        
        // $.ajax(...);
    })
});

$('input').selectize({
    plugins: {
        'delayed_select': {
            selectSingleMatch: false,
            filter: function(input, item) {
                return input == item.code;
            }
        }
    },

    load: function(query, callback) {
        if (query.length < 2) return callback();
        
        // $.ajax(...);
    })
});