Flex indexes not working for array fields

Create travel-sample
drop def_primary
create fts index on array field public_likes with keyword analyzer

we can verify our fts index is working properly by searching the index for public_likes:Julius Tromp I and seeing that we get results

attempt to run this query
select * from `travel-sample` USE INDEX (index2 USING FTS) where "Julius Tromp I" in public_likes

{
"errors": [

{ "code": 4000, "msg": "No index available on keyspace travel-sample that matches your query. Use CREATE INDEX or CREATE PRIMARY INDEX to create an index, or check that your expected index is online.", "query_from_user": "explain select * from `travel-sample` USE INDEX (index2 USING FTS) where \"Julius Tromp I\" in public_likes" }

]
}