Control using reader node when using Aurora cluster endpoint

Hello, Team

We're using Mariadb connector/J to connect our Aurora database with cluster endpoint.
But sometimes select query is distributed to reader node so we would like to restrict all queries should be run on master server only.

1) Is this designed behavior that sometime select query is distributed to reader node when using cluster endpoint with MariaDB connector/J?

2) If yes, what is the exact condition when select query is distributed to reader node? Something like under high load on master?

3) If yes, is it possible to disable this behavior?