Search: Harden ContentDateEnrichment error handling and refresh timing

Throw InvalidOperationException on setup failures (index creation, enrich
policy, pipeline) instead of logging warnings and continuing silently.
This ensures CI fails fast when infrastructure setup is broken rather than
indexing documents without content_last_updated.

Add an explicit index refresh between reindex and enrich policy execution
in SyncLookupIndexAsync so newly reindexed documents are visible when the
policy snapshots the lookup index.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: reakaleek

src/Elastic.Markdown/Exporters/Elasticsearch/ContentDateEnrichment.cs

@@ -50,6 +50,7 @@ public async Task SyncLookupIndexAsync(string lexicalAlias, Cancel ct)
 
 		await DeleteLookupContentsAsync(ct);
 		await ReindexToLookupAsync(lexicalAlias, ct);
+		await RefreshLookupIndexAsync(ct);
 		await ExecutePolicyAsync(ct);
 
 		logger.LogInformation("Content date lookup sync complete");
@@ -88,9 +89,10 @@ private async Task EnsureLookupIndexAsync(Cancel ct)
 			ct
 		);
 		if (!response.ApiCallDetails.HasSuccessfulStatusCode)
-			logger.LogWarning("Failed to create content date lookup index {Index}: {Info}", _lookupIndex, response.ApiCallDetails.DebugInformation);
-		else
-			logger.LogInformation("Created content date lookup index {Index}", _lookupIndex);
+			throw new InvalidOperationException(
+				$"Failed to create content date lookup index {_lookupIndex}: {response.ApiCallDetails.DebugInformation}");
+
+		logger.LogInformation("Created content date lookup index {Index}", _lookupIndex);
 	}
 
 	private async Task PutEnrichPolicyAsync(Cancel ct)
@@ -112,9 +114,10 @@ private async Task PutEnrichPolicyAsync(Cancel ct)
 		);
 
 		if (!response.ApiCallDetails.HasSuccessfulStatusCode)
-			logger.LogWarning("Failed to create enrich policy {Policy}: {Info}", PolicyName, response.ApiCallDetails.DebugInformation);
-		else
-			logger.LogInformation("Created enrich policy {Policy}", PolicyName);
+			throw new InvalidOperationException(
+				$"Failed to create enrich policy {PolicyName}: {response.ApiCallDetails.DebugInformation}");
+
+		logger.LogInformation("Created enrich policy {Policy}", PolicyName);
 	}
 
 	private async Task ExecutePolicyAsync(Cancel ct)
@@ -126,9 +129,10 @@ private async Task ExecutePolicyAsync(Cancel ct)
 		);
 
 		if (!response.ApiCallDetails.HasSuccessfulStatusCode)
-			logger.LogWarning("Failed to execute enrich policy {Policy}: {Info}", PolicyName, response.ApiCallDetails.DebugInformation);
-		else
-			logger.LogInformation("Executed enrich policy {Policy}", PolicyName);
+			throw new InvalidOperationException(
+				$"Failed to execute enrich policy {PolicyName}: {response.ApiCallDetails.DebugInformation}");
+
+		logger.LogInformation("Executed enrich policy {Policy}", PolicyName);
 	}
 
 	private async Task PutPipelineAsync(Cancel ct)
@@ -174,9 +178,24 @@ private async Task PutPipelineAsync(Cancel ct)
 		);
 
 		if (!response.ApiCallDetails.HasSuccessfulStatusCode)
-			logger.LogWarning("Failed to create pipeline {Pipeline}: {Info}", PipelineName, response.ApiCallDetails.DebugInformation);
+			throw new InvalidOperationException(
+				$"Failed to create ingest pipeline {PipelineName}: {response.ApiCallDetails.DebugInformation}");
+
+		logger.LogInformation("Created ingest pipeline {Pipeline}", PipelineName);
+	}
+
+	private async Task RefreshLookupIndexAsync(Cancel ct)
+	{
+		var response = await operations.WithRetryAsync(
+			() => transport.PostAsync<StringResponse>($"/{_lookupIndex}/_refresh", PostData.Empty, ct),
+			$"POST {_lookupIndex}/_refresh",
+			ct
+		);
+
+		if (!response.ApiCallDetails.HasSuccessfulStatusCode)
+			logger.LogWarning("Failed to refresh lookup index {Index}: {Info}", _lookupIndex, response.ApiCallDetails.DebugInformation);
 		else
-			logger.LogInformation("Created ingest pipeline {Pipeline}", PipelineName);
+			logger.LogInformation("Refreshed lookup index {Index}", _lookupIndex);
 	}
 
 	private async Task DeleteLookupContentsAsync(Cancel ct)