Text search acts strangely

For example, on the manuscript page for Franciscan, CH-Fco 2:

- search for "Regem venturum" and "Regem venturum dominum" yields results

- "Regem venturum dominum venit" yields *more* results

- "Regem venturum dominum venite" yields no results
-

Reproduce the three query comparisons on the Franciscan, CH-Fco 2 manuscript page using the terms in the report. The issue names no source file, test, or expected matching semantics, so clarify the intended results before locating the search entry point and defining when the behavior is fixed.

Written by the indexing model from the issue text.