Minor Description
When a numeric key - `{ "123": ... }` - is present in a document, the Quick Index screen fails to properly select and identify that key and any nested fields.
The numeric keyed field itself generally can't be clicked/highlighted for inclusion into the index, like in the following screenshot. Nested fields are misidentified: field in the screenshot should be reported as "Searchable As: 456.works" 
In certain document layouts, the numeric key can be clicked, but is not reported for inclusion into the index:
