Make PublishEnvironment optional

Author: reakaleek

src/tooling/Elastic.Documentation.Tooling/Arguments/ExportOption.cs

@@ -60,9 +60,9 @@ public static class ExporterExtensions
 
 	public static IReadOnlyCollection<IMarkdownExporter> CreateMarkdownExporters(
 		this IReadOnlySet<Exporter> exportOptions,
-		PublishEnvironment environment,
 		ILoggerFactory logFactory,
-		IDocumentationConfigurationContext context
+		IDocumentationConfigurationContext context,
+		PublishEnvironment? environment = null
 	)
 	{
 		var markdownExporters = new List<IMarkdownExporter>(3);
@@ -73,7 +73,11 @@ IDocumentationConfigurationContext context
 		if (exportOptions.Contains(Elasticsearch))
 			markdownExporters.Add(new ElasticsearchMarkdownExporter(logFactory, context.Collector, context.Endpoints));
 		if (exportOptions.Contains(SemanticElasticsearch))
+		{
+			if (environment is null)
+				throw new ArgumentNullException(nameof(environment), "A publish environment is required when using the semantic elasticsearch exporter");
 			markdownExporters.Add(new ElasticsearchMarkdownSemanticExporter(environment, logFactory, context.Collector, context.Endpoints));
+		}
 		return markdownExporters;
 	}
 }

src/tooling/docs-assembler/Building/AssemblerBuilder.cs

@@ -41,7 +41,7 @@ public async Task BuildAllAsync(PublishEnvironment environment, FrozenDictionary
 
 		var redirects = new Dictionary<string, string>();
 
-		var markdownExporters = exportOptions.CreateMarkdownExporters(environment, logFactory, context);
+		var markdownExporters = exportOptions.CreateMarkdownExporters(logFactory, context, environment);
 
 		var tasks = markdownExporters.Select(async e => await e.StartAsync(ctx));
 		await Task.WhenAll(tasks);