I have the same issue tried various different things but no luck I have essentially adapted the ezSearch for my purpose and all that is remaining is the order by please help:

Query builder:

// Perform the search
var searcher = ExamineManager.Instance.CreateSearchCriteria();

var query = searcher.NodeTypeAlias("umbPropertyDetails"); 
query.Not().Field("umbracoNaviHide", "1");

// Set search path
        var contentPathFilter = model.RootContentNodeId > 0
            ? string.Format("__IndexType:{0} +searchPath:{1} -template:0", UmbracoExamine.IndexTypes.Content, model.RootContentNodeId)
            : string.Format("__IndexType:{0} -template:0", UmbracoExamine.IndexTypes.Content);

        var mediaPathFilter = model.RootMediaNodeId > 0
            ? string.Format("__IndexType:{0} +searchPath:{1}", UmbracoExamine.IndexTypes.Media, model.RootMediaNodeId)
            : string.Format("__IndexType:{0}", UmbracoExamine.IndexTypes.Media);

    // Ensure page contains all search terms in some way
    if (model.Location != "any")
    {
        query.And().Field("regionID", model.Location);
    }
    if (model.MinPrice >= 0 && model.MaxPrice > 0)
    {
        var paddedLower = model.MinPrice.ToString("D6");
        var paddedHigher = model.MaxPrice.ToString("D6");
        //groupedOr.AppendFormat(String.Format(searchField + ":[{0} TO {1}]", model.MinPrice, model.MaxPrice));
        query.And().Range("price", paddedLower, paddedHigher, true, true);
    }

    if (model.MinBedrooms > 0)
    {
        query.And().Field("propertyBedrooms", model.MinBedrooms.ToString());
    }
    var results = ExamineManager.Instance.Search(query.Compile()) 
    .Where(x => (
         !Umbraco.IsProtected(int.Parse(x.Fields["id"]), x.Fields["path"]) ||
         (
             Umbraco.IsProtected(int.Parse(x.Fields["id"]), x.Fields["path"]) &&
             Umbraco.MemberHasAccess(int.Parse(x.Fields["id"]), x.Fields["path"])
         )) && (
             (x.Fields["__IndexType"] == UmbracoExamine.IndexTypes.Content && Umbraco.TypedContent(int.Parse(x.Fields["id"])) != null) ||
             (x.Fields["__IndexType"] == UmbracoExamine.IndexTypes.Media && Umbraco.TypedMedia(int.Parse(x.Fields["id"])) != null)
         ))
    .ToList();
    model.AllResults = results;

    model.TotalResults = results.Count;
    model.TotalPages = (int)Math.Ceiling((decimal)model.TotalResults / model.PageSize);
    model.CurrentPage = Math.Max(1, Math.Min(model.TotalPages, model.CurrentPage));

    // Page the results
    model.PagedResults = model.AllResults.Skip(model.PageSize * (model.CurrentPage - 1)).Take(model.PageSize).OrderBy(r => r.Fields["price"]);

    LogHelper.Debug<string>("[ezSearch] Searching Lucene with the following query: " + query.ToString());

Tried solution 1 adding to the query:

if (!string.IsNullOrEmpty(model.SortOrder))
{
    switch (model.SortOrder)
    {
        case "price-low":
            query.And().OrderByDescending(new string[] { "price" });
            break;
        case "price-high":
            query.And().OrderBy(new string[] { "price" });
            break;
        default:
            query.And().OrderBy(new string[] { "price" });
            break;
    }
}

Tried Solution 2 append to the results:

if (!string.IsNullOrEmpty(model.SortOrder))
{
        switch (model.SortOrder)
           {
                case "price-low":
                    //query.And().OrderByDescending(new string[] { "price" });
                    model.AllResults = results.OrderBy(r => r.Fields, "price" );
                    break;
                case "price-high":
                    model.AllResults = results.OrderByDescending(r => r.Fields["price"]);
                    break;
                default:
                    model.AllResults = results.OrderByDescending(r => r.Fields["price"]);
                    break;
            }
        }

And Solution 3 in contentResult Helper

@helper RenderContentResult(SearchViewModel model, IPublishedContent result)
{

foreach (var field in model.AllResults .Where(field => result.HasValue(field)).OrderBy(r => result.GetPropertyValue<int>("price")))
{