You shouldn't really need to change any advanced settings for it to work.
Those are usually for specific use-cases or performance tuning. If it works nicely for you, I'd say don't do so (unless you want to experiment).
As for the index pattern, it's just a matter of preference. If you want your indices to be named just based on the domain name, or append a prefix or anything. There is no set rule on this.
so a new _index was created. new index name is "aner-new-index"
i can see it in my events via discover.
now i want to grant a user priv based on that new index.
however, the only indices i have are * and logstash-*
cant see "aner-new-index". whats missing here?