ApplicationConfiguration.java

@SpringBootApplication(exclude = {MongoAutoConfiguration.class, 
                                  MongoDataAutoConfiguration.class })
@EnableReactiveMongoRepositories
@AutoConfigureAfter(EmbeddedMongoAutoConfiguration.class)
public class ApplicationConfiguration 
  extends AbstractReactiveMongoConfiguration {

    private final Environment environment;

    public ApplicationConfiguration(Environment environment) {
        this.environment = environment;
    }

    @Bean
    public LoggingEventListener mongoEventListener() {
        return new LoggingEventListener();
    }

    @Override
    @Bean
    @DependsOn("embeddedMongoServer")
    public MongoClient reactiveMongoClient() {
        int port = environment.getProperty("local.mongo.port", Integer.class);
        return MongoClients.create(String.format("mongodb://localhost:%d", port));
    }

    @Override
    protected String getDatabaseName() {
        return "reactive";
    }
}