Does not find records by ID

As discovered in UISE-49, it looks like mod-codex-ekb doesn't find records by ID (i.e. using the internal identifier as the query term with the id index.)

To reproduce: search for id="263*" sortby title. Should find a record, but does not.

To reproduce in the UI:

On http://folio-snapshot.aws.indexdata.com/eholdings go to the eHoldings app, click on "Titles" and search for "a". Click on any result – for example, the first one, A&G Information Services. The eHoldings app doesn't expose the internal ID, but you can see it in the URL: 263. The HTTP request (/eholdings/titles/263?include=customerResources) and response also confirm that this is the ID.

So now go to the Codex Search application, select the "ID" query-index, uncheck the "Available online" filter and type "263" into the query box. You get no hits.

The Network tab of the browser's developer tools shows that the right search is being sent (id="263*") sortby title. So it looks like mod-codex-ekb is not correctly interpreting that search.