Sort not works on string field

Elastic Stack Elasticsearch
1

Sort() function not working on string fields of the document. this is my query:
(I use the latest version of Nest client in c# dotnet 5)

var res = await elasticClient.SearchAsync<CustomerModel>(s => s.Index("customers").From(from)
                    .Size(filter.PageSize)
                    .Query(q => q
                        .Bool(b => b
                            .Filter(
                            sh => sh.Match(m => m.Field(f => f.PartyContracts.Any(a => a.Contract.Any(a => a.ContractTypeId == 1)))),

.Sort(q => q.Ascending(f => f.cache_FirstName))
 );

it doesn't give me the result but when commenting on the sort line it will be fixed.
what is the problem?

2

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