title: How do I use FreeFormTextRecordSetWriter
body: <p>I my Nifi controller I want to configure the <code>FreeFormTextRecordSetWriter</code>, but I have no Idea what I should put in the <code>"Text"</code> field.  I'm getting the text from my source (in my case <code>GetSolr</code>), and just want to write this, period.
  Documentation and mailinglist do not seem to tell me how this is done, any help appreciated.</p>
  
  <p><strong>EDIT: Here the sample input + output I want to achieve (as you can see: not ransformation needed, plain text, no JSON input)</strong></p>
  
  <p><strong>EDIT: I now realize, that I can't tell GetSolr to return just CSV data - but I have to use Json</strong> 
  So referencing with attribute seems to be fine.  What the documentation omits is, that the ${flowFile} attribute should containt the complete flowfile that is returned.</p>
  
  <p>Sample input:</p>
  
  <pre><code>{
    "responseHeader": {
      "zkConnected": true,
      "status": 0,
      "QTime": 0,
      "params": {
        "q": "*:*",
        "_": "1553686715465"
      }
    },
    "response": {
      "numFound": 3194,
      "start": 0,
      "docs": [
        {
          "id": "{402EBE69-0000-CD1D-8FFF-D07756271B4E}",
          "MimeType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
          "FileName": "Test.docx",
          "DateLastModified": "2019-03-27T08:05:00.103Z",
          "_version_": 1629145864291221504,
          "LAST_UPDATE": "2019-03-27T08:16:08.451Z"
        }
      ]
    }
  }
  </code></pre>
  
  <p>Wanted output</p>
  
  <pre><code>{402EBE69-0000-CD1D-8FFF-D07756271B4E}
  </code></pre>
  
  <p><strong>BTW: The documentation says this:</strong></p>
  
  <blockquote>
    <p>The text to use when writing the results. This property will evaluate the Expression Language using any of the fields available in a Record.
    Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</p>
  </blockquote>
  
  <p>I want to use my source's text, so I'm confused</p>