title: Multiple streams from a single master topic
body: <p>How can I make multiple streams from a single master topic? When I do something like this:</p>
  
  <pre class="lang-java prettyprint-override"><code>KStreamBuilder builder = new KStreamBuilder();
  
  builder.stream(Serdes.String(), Serdes.String(), "master")
              /* Filtering logic */
              .to(Serdes.String(), Serdes.String(), "output1");
  
  builder.stream(Serdes.String(), Serdes.String(), "master")
              /* Filtering logic */
              .to(Serdes.String(), Serdes.String(), "output2");
  
  KafkaStreams streams = new KafkaStreams(builder, /* config */);
  streams.start();
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>org.apache.kafka.streams.errors.TopologyBuilderException: Invalid topology building: Topic master has already been registered by another source.
      at org.apache.kafka.streams.processor.TopologyBuilder.addSource(TopologyBuilder.java:347)
      at org.apache.kafka.streams.kstream.KStreamBuilder.stream(KStreamBuilder.java:92)
  </code></pre>
  
  <p><strong>Do I need to make another instance of KafkaStreams for each stream from "master"?</strong></p>