Apache Flink

Hello, Is there a way to run multiple async data stream operations within a single job and then combine them later .. any resources or blog posts will be helpful ..

Basically i want to do something like this

```Master Async Operation -&gt; Based data of master async operation conditionally run one or more Async operations -&gt; Combine these async operations and spit out into single sink ```

I can use side Outputs in flink where it will be

```Master Async Operation -&gt; Create side outputs based on a condition -&gt; Multiple data streams from side outputs-&gt; union all streams```
But there will be many side outputs ... do you know how can we get all the side outputs listed?