public List<Token> tokenize(String string) {
        return tokenize(string, new IndexFacts().newSession(Set.of(), Set.of()));
    }
Resets this tokenizer and create tokens from the given string, using
"default" as the default index, and using no index information.

@return a read-only list of tokens. This list can only be used by this thread
container-search/src/main/java/com/yahoo/prelude/query/parser/Tokenizer.java