So the - is working, contrary to the claims of several people here. The bottom line is that it is super easy to get results with shirts that don't have stripes, if you don't expect your search engine to understand English (which it would be wildly unrealistic to expect, and, besides, is not what you want).
While it is easy to get results based on certain keyword matching, Google has been publicly touting their ability to use NLP in search to better understand english. So this just shows a small limitation in their BERT models (https://www.blog.google/products/search/search-language-unde...). Doesn't make it any less impressive.
