NIFI-9215:
- During mouse over events the items in the Controller Service Types table could not be looked up because the identifier of the item was an integer value and the identifier was a string value. Addressing the issue by always using a string.

This closes #5439

Signed-off-by: Scott Aslan <scottyaslan@gmail.com>
diff --git a/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-ui/src/main/webapp/js/nf/canvas/nf-controller-services.js b/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-ui/src/main/webapp/js/nf/canvas/nf-controller-services.js
index 35ecd7e..f4d3962 100644
--- a/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-ui/src/main/webapp/js/nf/canvas/nf-controller-services.js
+++ b/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-ui/src/main/webapp/js/nf/canvas/nf-controller-services.js
@@ -595,7 +595,7 @@
 
                 // add the documented type
                 controllerServiceTypesData.addItem({
-                    id: id++,
+                    id: id++ + '',
                     label: nfCommon.substringAfterLast(documentedType.type, '.'),
                     type: documentedType.type,
                     bundle: documentedType.bundle,