Revert #8018

Author: flobernd

src/Elastic.Clients.Elasticsearch.Shared/Core/Infer/Fields/FieldsConverter.cs

@@ -22,8 +22,7 @@ internal sealed class FieldsConverter : JsonConverter<Fields>
 			Fields fields = reader.GetString();
 			return fields;
 		}
-
-		if (reader.TokenType == JsonTokenType.StartArray)
+		else if (reader.TokenType == JsonTokenType.StartArray)
 		{
 			var fields = new List<Field>();
 			while (reader.Read() && reader.TokenType != JsonTokenType.EndArray)
@@ -46,19 +45,6 @@ public override void Write(Utf8JsonWriter writer, Fields value, JsonSerializerOp
 			return;
 		}
 
-		if (value.ListOfFields.Count == 0)
-		{
-			writer.WriteStartObject();
-			writer.WriteEndObject();
-			return;
-		}
-
-		if (value.ListOfFields.Count == 1)
-		{
-			JsonSerializer.Serialize(writer, value.ListOfFields[0], options);
-			return;
-		}
-
 		writer.WriteStartArray();
 		foreach (var field in value.ListOfFields)
 		{