title: Is possible to convert a Flux to Mono
body: <p>I playing around with r2dc for spring boot java application.</p>
  <p>I was thinking if possible to convert a Flux to Mono for certain calculation.</p>
  <p>Pseudo example:</p>
  <pre><code>static PseudoMagic calculate(List&lt;Foo&gt; foos) {
     return callTheMagicRutine(foos)
  }
  
  Mono&lt;PseudoMagic&gt; getMyMagic() {
     Flux&lt;Foo&gt; foos = getMyFoos()
     foos.transformToMagic(f -&gt; calculator(f))
  }
  </code></pre>