private void closeAsync(CompletableFuture<?> future) {
        if (!initialEndpointsFuture.isDone()) {
            initialEndpointsFuture.cancel(false);
        }
        doCloseAsync(future);
    }
Fails the initialization of this {@link DynamicEndpointGroup} with the specified {@link Throwable}.
core/src/main/java/com/linecorp/armeria/client/endpoint/DynamicEndpointGroup.java