Check success of indexeddb createIndex

I'm noticing a decent delay between being able to retrieve results and creation and population of an IndexedDB objectStore. I suspect that the indexing is still running after a large number of "put"s are done, but I'm not sure how to measure each part (createobjectStore, createIndex), and report back.

Is there a simple way to check the success of the index being created?

request.onupgradeneeded = function(e) {
    var db = e.target.result;
    var partsStore = db.createObjectStore("parts", { keyPath: "classID", autoIncrement: true });
     partsStore.createIndex("description", "description", { unique: false });
}