Hand-craft IndexSettingsTimeSeriesConverter to handle out-of-range dates (#8873)

(cherry picked from commit 90fc7c9)

Author: flobernd

src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettingsTimeSeries.Converters.g.cs

@@ -23,7 +23,6 @@
 
 namespace Elastic.Clients.Elasticsearch.IndexManagement;
 
-[System.Text.Json.Serialization.JsonConverter(typeof(Elastic.Clients.Elasticsearch.IndexManagement.Json.IndexSettingsTimeSeriesConverter))]
 public sealed partial class IndexSettingsTimeSeries
 {
 	public IndexSettingsTimeSeries()

src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettingsTimeSeries.g.cs

@@ -0,0 +1,12 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json.Serialization;
+
+namespace Elastic.Clients.Elasticsearch.IndexManagement;
+
+[JsonConverter(typeof(Json.IndexSettingsTimeSeriesConverter))]
+public sealed partial class IndexSettingsTimeSeries
+{
+}

src/Elastic.Clients.Elasticsearch/_Shared/Types/IndexManagement/IndexSettingsTimeSeries.cs

@@ -0,0 +1,75 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+using Elastic.Clients.Elasticsearch.Serialization;
+
+namespace Elastic.Clients.Elasticsearch.IndexManagement.Json;
+
+public sealed class IndexSettingsTimeSeriesConverter : JsonConverter<IndexSettingsTimeSeries>
+{
+	private static readonly JsonEncodedText PropEndTime = JsonEncodedText.Encode("end_time"u8);
+	private static readonly JsonEncodedText PropStartTime = JsonEncodedText.Encode("start_time"u8);
+
+	public override IndexSettingsTimeSeries Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+	{
+		reader.ValidateToken(JsonTokenType.StartObject);
+		LocalJsonValue<DateTimeOffset?> propEndTime = default;
+		LocalJsonValue<DateTimeOffset?> propStartTime = default;
+		while (reader.Read() && reader.TokenType is JsonTokenType.PropertyName)
+		{
+			if (propEndTime.TryReadProperty(ref reader, options, PropEndTime, static DateTimeOffset? (ref Utf8JsonReader r, JsonSerializerOptions o) => ReadDateTime(ref r, o)))
+			{
+				continue;
+			}
+
+			if (propStartTime.TryReadProperty(ref reader, options, PropStartTime, static DateTimeOffset? (ref Utf8JsonReader r, JsonSerializerOptions o) => ReadDateTime(ref r, o)))
+			{
+				continue;
+			}
+
+			if (options.UnmappedMemberHandling is JsonUnmappedMemberHandling.Skip)
+			{
+				reader.SafeSkip();
+				continue;
+			}
+
+			throw new JsonException($"Unknown JSON property '{reader.GetString()}' for type '{typeToConvert.Name}'.");
+		}
+
+		reader.ValidateToken(JsonTokenType.EndObject);
+		return new IndexSettingsTimeSeries(JsonConstructorSentinel.Instance)
+		{
+			EndTime = propEndTime.Value,
+			StartTime = propStartTime.Value
+		};
+	}
+
+	public override void Write(Utf8JsonWriter writer, IndexSettingsTimeSeries value, JsonSerializerOptions options)
+	{
+		writer.WriteStartObject();
+		writer.WriteProperty(options, PropEndTime, value.EndTime, null, static (Utf8JsonWriter w, JsonSerializerOptions o, DateTimeOffset? v) => w.WriteNullableValueEx<DateTimeOffset>(o, v, typeof(DateTimeMarker)));
+		writer.WriteProperty(options, PropStartTime, value.StartTime, null, static (Utf8JsonWriter w, JsonSerializerOptions o, DateTimeOffset? v) => w.WriteNullableValueEx<DateTimeOffset>(o, v, typeof(DateTimeMarker)));
+		writer.WriteEndObject();
+	}
+
+	private static DateTimeOffset? ReadDateTime(ref Utf8JsonReader reader, JsonSerializerOptions options)
+	{
+		// Detect ISO 8601-1:2019 extended year format (prefixed with '-' or '+') which cannot be
+		// represented by DateTimeOffset. Clamp to the nearest representable value.
+		if (reader.TokenType is JsonTokenType.String)
+		{
+			var span = reader.ValueSpan;
+			if (span.Length > 0 && span[0] == (byte)'-')
+				return DateTimeOffset.MinValue;
+			if (span.Length > 0 && span[0] == (byte)'+')
+				return DateTimeOffset.MaxValue;
+		}
+
+		return reader.ReadNullableValueEx<DateTimeOffset>(options, typeof(DateTimeMarker));
+	}
+}