"[query_string] query does not support [fields]" error

[gpetrou]

Elastic.Clients.Elasticsearch version: 8.12.0

Elasticsearch version: 8.2.2

.NET runtime version: net8.0

Operating system version: Windows 11

Description of the problem including expected versus actual behavior: Using Fields property of QueryStringQuery does not work anymore. There is a "[query_string] query does not support [fields]" error.

Steps to reproduce:

Elastic.Clients.Elasticsearch.QueryDsl.QueryStringQuery queryStringQuery = new()
{
    Fields = new[] { "test" }
};

SearchRequest<JsonObject> elasticSearchRequest = new("IndexName")
{
    Query = queryStringQuery
};

Elastic.Clients.Elasticsearch.SearchResponse<JsonObject> expected = await _elasticsearchClient.SearchAsync<JsonObject>(elasticSearchRequest);

Expected behavior The code does not result in an error.

Provide ConnectionSettings (if relevant):

Provide DebugInformation (if relevant):