Does Smart Search work on Custom Fields?

ES 1.2.14 on J3.3

I am testing the regular Search (Joomla Smart Search) function (not Advanced Search, which works fine).

If I input the member's name, the search works.

If I input the member's school, then there are no search results. If I use Advanced Search, I do receive search results.

I indexed the content just prior to running the test.

Please advise.

Thanks