title: Not able to get the nifi processor group status
body: <p>I am new to Nifi. I have define a processor group in Nifi and I have started the dataflow.</p>
  <p>From the backend, how can I check the status of the processor group whether it is running or not?.</p>
  <p>I tried</p>
  <pre><code>/bin/nifi.sh status
  </code></pre>
  <p>But it only gives the overall nifi status whether it is running or not</p>