title: Merge two JSON flowfile together in NiFi
body: <p>i want to merge two flowfile that contain JSON object by same specified attribute...</p>
  
  <p><strong>flow1:</strong></p>
  
  <pre><code>attribute:    
  xuuid = 123456
  
  content:
  {
  "sname":"jack",
  "id":"00001",
  "state":"NY"
  }
  </code></pre>
  
  <p><strong>flow2:</strong></p>
  
  <pre><code>attribute:    
  xuuid = 123456
  
  content:
  {
  "country":"US",
  "date":"1983"
  }
  </code></pre>
  
  <p>and i expect this form of data in single output flow:</p>
  
  <p><strong>desired_flow:</strong></p>
  
  <pre><code>attribute:    
  xuuid = 123456
  
  content:
  {
  "sname":"jack",
  "id":"00001",
  "state":"NY",
  "country":"US",
  "date":"1983"
  }
  </code></pre>
  
  <p>how do i play with this? MergeContent processor or MergeRecord?
  i think mergerecord can handle it but i confusing on it.</p>