either add support for searching by neighborhood, or add custom error messages for neighborhood searches

examples:
52 Church St, Cambridge, MA 02138 (works. this is the sinclair)

Harvard Square (does not work. example of neighborhood)

No file or test is named. Begin by locating the search entry point, reproduce the working street-address search and failing “Harvard Square” search, then clarify whether the intended outcome is neighborhood support or a custom error message. Done should mean the chosen behavior is implemented and covered for the neighborhood example.

Written by the indexing model from the issue text.