title: Observable to Flux Conversion
body: <p>I have my code in Rxjava and I want to change it reactor project.
  My rxjava code is</p>
  
  <pre><code>public Observable&lt;Map&lt;Integer, Data&gt;&gt; getObject(List&lt;Integer&gt; ids, List&lt;String&gt; filters) {
          if (ids == null || ids.isEmpty()) {
              return Observable.just(new HashMap&lt;&gt;());
          }
          return Observable.fromCallable(() -&gt; {
              Map&lt;Integer, Data&gt; data=  client.getObject(ids, filters).getData();
              return data;
          });
      }
  </code></pre>
  
  <p>How do I write this code using Flux / Mono?
  What should I use(Flux / Mono)?</p>
  
  <p>Basically I want to know how to store Map to Flux like Observable or should I use Mono</p>