The stop-words.xml folder can be accessed under Applications > Searchblox Server > web apps > stopwords. This folder includes a variety of languages. Edit your language .xml by adding, updating, and deleting stop-words for your indexing specification.
Stop-words are defined as non-information-bearing words. Words such as the, and, a, is, and on are on the stop-word list. When indexing and searching, these words will be ignored. Each language has its own stop-word list. In order to save disk space or to speed up search results, most search engines do not consider these common words.