Add app config for text chunker page setings

Author: jelledruyts

azuredeploy.json

@@ -410,6 +410,14 @@
                             "name": "StorageContainerNameBlobChunks",
                             "value": "[variables('storageContainerNameBlobChunks')]"
                         },
+                        {
+                            "name": "TextChunkerPageLength",
+                            "value": "[variables('textChunkerPageLength')]"
+                        },
+                        {
+                            "name": "TextChunkerPageOverlap",
+                            "value": "[variables('textChunkerPageOverlap')]"
+                        },
                         {
                             "name": "TextEmbedderFunctionEndpointPython",
                             "value": "[concat('https://', reference(resourceId('Microsoft.Web/sites', variables('functionAppNamePython')), '2022-09-01').defaultHostName, '/api/chunk-embed')]"
@@ -537,11 +545,11 @@
             "value": "[variables('functionApiKey')]"
         },
         "textChunkerPageLength": {
-            "type": "string",
+            "type": "int",
             "value": "[variables('textChunkerPageLength')]"
         },
         "textChunkerPageOverlap": {
-            "type": "string",
+            "type": "int",
             "value": "[variables('textChunkerPageOverlap')]"
         },
         "textEmbedderNumTokens": {

src/Azure.AISearch.WebApp/Services/AzureCognitiveSearchConfigurationService.cs

@@ -201,7 +201,7 @@ private SearchIndexerSkillset GetDocumentsSearchIndexerSkillset(AppSettingsOverr
         var searchIndexerSkillType = GetSearchIndexerSkillType(settingsOverride);
         var skillset = new SearchIndexerSkillset(GetSkillsetName(indexName), Array.Empty<SearchIndexerSkill>());
 
-        if (string.Equals(searchIndexerSkillType, Constants.SearchIndexerSkillTypes.Integrated, StringComparison.InvariantCultureIgnoreCase))
+        if (string.IsNullOrWhiteSpace(searchIndexerSkillType) || string.Equals(searchIndexerSkillType, Constants.SearchIndexerSkillTypes.Integrated, StringComparison.InvariantCultureIgnoreCase))
         {
             // Use integrated vectorization (no custom skills required).
             ArgumentNullException.ThrowIfNull(this.settings.OpenAIEndpoint);