Make CorsOptions.maxAgeInSeconds x-nullable (Azure#17900)

Fixes Azure#16928

Author: heaths

eng/Packages.Data.props

@@ -152,6 +152,7 @@
     <PackageReference Update="FsCheck.Xunit" Version="2.14.0" />
     <PackageReference Update="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
     <PackageReference Update="Microsoft.AspNetCore.Server.WebListener" Version="1.0.2" />
+    <PackageReference Update="Microsoft.Azure.Core.Spatial" Version="1.0.0" />
     <PackageReference Update="Microsoft.Azure.Devices" Version="1.19.0" />
     <PackageReference Update="Microsoft.Azure.Devices.Client" Version="1.27.0" />
     <PackageReference Update="Microsoft.Azure.Graph.RBAC" Version="2.2.2-preview" />

sdk/core/Microsoft.Azure.Core.Spatial/src/Microsoft.Azure.Core.Spatial.props

@@ -1,6 +1,5 @@
 <Project>
   <ItemGroup>
-    <!-- TODO: Convert this to a PackageReference when Microsoft.Azure.Core.Spatial is published -->
-    <ProjectReference Include="$(MSBuildThisFileDirectory)$(MSBuildThisFileName).csproj" />
+    <PackageReference Include="Microsoft.Azure.Core.Spatial" />
   </ItemGroup>
 </Project>

sdk/search/Azure.Search.Documents/src/Generated/Models/CorsOptions.Serialization.cs

@@ -193,6 +193,14 @@ directive:
     $.properties.endTime["x-nullable"] = true;
 ```
 
+``` yaml
+directive:
+  from: swagger-document
+  where: $.definitions.CorsOptions
+  transform: >
+    $.properties.maxAgeInSeconds["x-nullable"] = true;
+```
+
 #### Skills
 
 ``` yaml

sdk/search/Azure.Search.Documents/src/autorest.md

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System.Text.Json;
+using Azure.Search.Documents.Indexes.Models;
+using NUnit.Framework;
+
+namespace Azure.Search.Documents.Tests.Models
+{
+    public class CorsOptionsTests
+    {
+        [Test]
+        public void MaxAgeInSecondsNull()
+        {
+            JsonDocument doc = JsonDocument.Parse(@"{
+    ""allowedOrigins"": [
+        ""*""
+    ],
+    ""maxAgeInSeconds"": null
+}");
+
+            CorsOptions sut = CorsOptions.DeserializeCorsOptions(doc.RootElement);
+
+            CollectionAssert.AreEqual(sut.AllowedOrigins, new[] { "*" });
+            Assert.IsNull(sut.MaxAgeInSeconds);
+        }
+    }
+}