Cassandra doesn't wait for nodes to be available

I'm using the datastax driver for java:

@Dao
public interface MyDao {
    @Insert
    CompletableFuture<Void> save(MyEntity entity);
    ...
}

public class MyDaoTests {
    
    @Test
    public void myTest() {
    ...
    List<CompletableFuture<Void>> futureList = myEntityList.parallelStream()
             .map((myEntity) -> meterDataMapper.myDao().save(myEntity))
             .collect(Collectors.toList());
    CompletableFuture.allOf(futureList.toArray(CompletableFuture[]::new)).join();
    ...
   }
}

When I execute the test, I get this error:
java.util.concurrent.CompletionException: com.datastax.oss.driver.api.core.NoNodeAvailableException: No node was available to execute the query

Is there a way to configure the driver/session to wait for available nodes?

Further information:

• My test size is about 2500000 entities (myEntityList).
• Synchronous inserts work fine, but they're way too slow.
• I want to solve this with the datastax-java-driver mapper, annotation-based, as simple as possible.
• Driver Version: 4.9.0