Update historymapping.yml to exclude Serverless mappings (#948)

* Update historymapping.yml

* - Add support for acquiring the best first match for multiple mapped page definition on front matter

- Fix path replacement issue

* Allow the default mapped page url if no better matches were found

---------

Co-authored-by: Felipe Cotti <[email protected]>

Author: bmorelli25

src/Elastic.Markdown/IO/HistoryMapping/HistoryMapper.cs

@@ -6,10 +6,10 @@ namespace Elastic.Markdown.IO.HistoryMapping;
 
 public interface IHistoryMapper
 {
-	string? MapLegacyUrl(string? currentUrl);
+	string? MapLegacyUrl(IReadOnlyCollection<string>? mappedPages);
 }
 
 public record BypassHistoryMapper : IHistoryMapper
 {
-	public string? MapLegacyUrl(string? currentUrl) => null;
+	public string? MapLegacyUrl(IReadOnlyCollection<string>? mappedPages) => null;
 }

src/Elastic.Markdown/Slices/HtmlWriter.cs

@@ -107,7 +107,7 @@ private async Task<string> RenderLayout(MarkdownFile markdown, MarkdownDocument
 
 		var siteName = DocumentationSet.Tree.Index?.Title ?? "Elastic Documentation";
 
-		var legacyUrl = HistoryMapper.MapLegacyUrl(markdown.YamlFrontMatter?.MappedPages?.FirstOrDefault());
+		var legacyUrl = HistoryMapper.MapLegacyUrl(markdown.YamlFrontMatter?.MappedPages);
 
 		var slice = Index.Create(new IndexViewModel
 		{

src/docs-assembler/Mapping/PageHistoryMapper.cs

@@ -12,15 +12,22 @@ public record PageHistoryMapper : IHistoryMapper
 
 	public PageHistoryMapper(IReadOnlyDictionary<string, string> previousUrls) => PreviousUrls = previousUrls;
 
-	public string? MapLegacyUrl(string? currentUrl)
+	public string? MapLegacyUrl(IReadOnlyCollection<string>? mappedPages)
 	{
-		if (currentUrl is null)
+		if (mappedPages is null)
 			return null;
 
-		var versionMarker = PreviousUrls.FirstOrDefault(x => currentUrl.Contains(x.Key));
-		if (versionMarker.Key == string.Empty)
-			return null;
+		foreach (var mappedPage in mappedPages)
+		{
+			var versionMarker = PreviousUrls.FirstOrDefault(x => mappedPage.Contains(x.Key));
+			if (versionMarker.Key != string.Empty && versionMarker.Value != "undefined")
+			{
+				return mappedPage.Contains("current")
+					? mappedPage.Replace($"{versionMarker.Key}current/", $"{versionMarker.Key}{versionMarker.Value}/")
+					: null;
+			}
+		}
 
-		return !currentUrl.Contains("current") ? null : currentUrl.Replace($"{versionMarker.Key}/current/", $"{versionMarker.Key}/{versionMarker.Value}/");
+		return mappedPages.FirstOrDefault();
 	}
 }

src/docs-assembler/historymapping.yml

@@ -61,6 +61,7 @@ mappings:
   en/logstash-versioned-plugins: undefined
   en/search-ui: undefined
   en/security: stack
+  en/serverless: undefined
   en/starting-with-the-elasticsearch-platform-and-its-solutions: stack
   en/observability: stack
   en/elasticsearch/painless: stack