Is there any guideline on sanitizing the query term for RediSearch, e.g. certain characters such as * at the end of a term or @ - at start of term have special purposes in the query syntax and would be good to strip some/all of them out for queries where the special purpose doesn't apply. Also, I'm wondering if there are any security implications of passing in arbitrary query strings.
Re security - no, redis itself makes sure that injection is impossible. You might want to check the limits on string lengths etc. At worst (barring bugs) a badly formed query will cause a syntax error to be returned.
Re syntax - yes, make sure the reserved symbols like @!{}()|-=> are either escaped or stripped.