reactor-core/src/main/java/reactor/core/publisher/Mono.java
public final <V> Mono<V> thenReturn(V value) {
	    return then(Mono.just(value));
	}
public final <V> Mono<V> thenReturn(V value) {
	    return then(Mono.just(value));
	}
Let this {@link Mono} complete then emit the provided value.
<p>
<img class="marble" src="doc-files/marbles/thenReturn.svg" alt="">

@reactor.discard This operator discards the element from the source.

@param value a value to emit after termination
@param <V> the element type of the supplied value

@return a new {@link Mono} that emits the supplied value