如何在spring boot的application.yml中配置cassandra？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-cassandra</artifactId>
</dependency>

spring:
  data:
    cassandra:
      contact-points: localhost
      port: 9042
      keyspace-name: mykeyspace
      username: myusername
      password: mypassword

@Configuration
public class CassandraConfig extends AbstractCassandraConfiguration {

    @Value("${spring.data.cassandra.contact-points}")
    private String contactPoints;

    @Value("${spring.data.cassandra.port}")
    private int port;

    @Value("${spring.data.cassandra.keyspace-name}")
    private String keyspaceName;

    @Value("${spring.data.cassandra.username}")
    private String username;

    @Value("${spring.data.cassandra.password}")
    private String password;

    @Override
    protected String getKeyspaceName() {
        return keyspaceName;
    }

    @Override
    protected String getContactPoints() {
        return contactPoints;
    }

    @Override
    protected int getPort() {
        return port;
    }

    @Override
    protected String getLocalDataCenter() {
        return null;
    }

    @Override
    protected AuthProvider getAuthProvider() {
        return new PlainTextAuthProvider(username, password);
    }
}

@Repository
public class MyRepository {

    private final CassandraTemplate cassandraTemplate;

    public MyRepository(CassandraTemplate cassandraTemplate) {
        this.cassandraTemplate = cassandraTemplate;
    }

    public void save(MyEntity entity) {
        cassandraTemplate.insert(entity);
    }

    public List<MyEntity> findAll() {
        return cassandraTemplate.select("SELECT * FROM mytable", MyEntity.class);
    }
}