Sorting by multiple fields when creating a SortOptionsDescriptor<T> results in only the last field sorting

[c5racing]

Elastic.Clients.Elasticsearch version: 8.1.7

.NET runtime version: .NET 9

Description of the problem including expected versus actual behavior:
I have a generic method and I pass in a SortOptionsDescriptor. When chaining multiple fields, sort is only occurring on the last field.

Steps to reproduce:

var defaultSort = new SortOptionsDescriptor<SearchWindowElasticSearchModel>().Field(a => a.Test, fs => fs.Order(SortOrder.Asc)).Field(a => a.Name, fs => fs.Order(SortOrder.Asc)).Field(a => a.SortOrder, fs => fs.Order(SortOrder.Asc)).Field(a => a.LastName, fs => fs.Order(SortOrder.Asc));

Expected behavior
I'd expect my search to be sorted by Test, Name, SortOrder, and then LastName.

What's occuring is my search is only sorting by LastName

[flobernd]

Hi @c5racing,

I think you are confused by the descriptor syntax. A descriptor method always sets aka. replaces the contents of a property. It's just a fluent replacement for a property setter.

This means your code is equivalent to:

var sortOptions = SortOptions.Field("a");
sortOptions = SortOptions.Field("b"); // overrides value
sortOptions = SortOptions.Field("c"); // overrides value again

You want to use this overload:

elasticsearch-net/src/Elastic.Clients.Elasticsearch/_Generated/Api/SearchRequest.g.cs

Line 2020 in 2bba155

public SearchRequestDescriptor<TDocument> Sort(params Action<Elastic.Clients.Elasticsearch.SortOptionsDescriptor<TDocument>>[] configure)

.Sort(defaultSort)

while defining defaultSort as:

var defaultSort = new Action<SortOptionsDescriptor<SearchWindowElasticSearchModel>>[]
{
    x => x.Field(a => a.Test, fs => fs.Order(SortOrder.Asc)),
    x => x.Field(a => a.Name, fs => fs.Order(SortOrder.Asc)),
    x => x.Field(a => a.SortOrder, fs => fs.Order(SortOrder.Asc)),
    x => x.Field(a => a.LastName, fs => fs.Order(SortOrder.Asc))
};

Please let me know if that solves your issue.

[c5racing]

Thank you @flobernd, that resolved my issue