title: NIFI: get value from json
body: <p>i have a queryCassandra which generate json like this one:</p>
  
  <pre><code>{"results":[{"term":"term1"},{"term":"term2"}..]}
  </code></pre>
  
  <p>Now, i want to get from this all the term values separated by some separator in string format; ex :
  term1,term2,term3 </p>
  
  <p>So i can pass this list as a string parameter for a java main program which i've alreat set.</p>
  
  <p>(i only need the transofrmation, not the java program execution)</p>
  
  <p>Thank you !</p>