@Slf4j
public class FluxPublishTest {

    @Test
    public void test() {

        Scheduler scheduler = Schedulers.immediate();

        Flux.range(1, 5)
                .map(n -> Mono.just(n).publishOn(scheduler).map(k -> process(k))
                        .thenEmpty(m -> log.info("Job Done")).subscribe()).subscribe();
    }

    public Mono<Object> process(Object n) {
        log.info("Processing : {}", n);
        return Mono.empty();
    }
}

15:21:22.753 [main] DEBUG reactor.util.Loggers$LoggerFactory - Using Slf4j logging framework
15:21:22.906 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Processing : 1
15:21:22.909 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Job Done
15:21:22.910 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Processing : 2
15:21:22.910 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Job Done
15:21:22.910 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Processing : 3
15:21:22.910 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Job Done
15:21:22.912 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Processing : 4
15:21:22.912 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Job Done
15:21:22.912 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Processing : 5
15:21:22.912 [main] INFO com.capitalone.fs.marketingone.FluxPublishTest - Job Done