title: JOLT remove all but first two fields
body: <p>Trying to use JOLT within Nifi to remove some fields from an API call, but having trouble getting it to work. Below is what is returned from the GitHub API:</p>
  <pre class="lang-json prettyprint-override"><code>[
    {
      &quot;login&quot;: &quot;sample name&quot;,
      &quot;id&quot;: &quot;000001&quot;,
      &quot;node_id&quot;: &quot;ID#&quot;,
      &quot;avatar_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;gravatar_id&quot;: &quot;&quot;,
      &quot;url&quot;: &quot;RETURNED_URL&quot;,
      &quot;html_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;followers_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;following_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;gists_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;starred_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;subscriptions_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;organizations_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;repos_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;events_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;received_events_url&quot;: &quot;RETURNED_URL&quot;,
      &quot;type&quot;: &quot;MEMBER_TYPE&quot;,
      &quot;site_admin&quot;: false
    },
  ...
   }
  ]
  </code></pre>
  <p>This is the JOLT Spec I have that is raising errors:</p>
  <pre><code>[
     {
        &quot;operation&quot;: &quot;remove&quot;,
       &quot;spec&quot;: {
          &quot;node_id&quot;:&quot;&quot;,
          &quot;avatar_url&quot;:&quot;&quot;,
          &quot;gravatar_id&quot;:&quot;&quot;,
          &quot;url&quot;:&quot;&quot;,
          &quot;html_url&quot;:&quot;&quot;,
          &quot;followers_url&quot;: &quot;&quot;,
          &quot;following_url&quot;: &quot;&quot;,
          &quot;gists_url&quot;: &quot;&quot;,
          &quot;starred_url&quot;: &quot;&quot;,
          &quot;subscriptions_url&quot;: &quot;&quot;,
          &quot;organizations_url&quot;: &quot;&quot;,
          &quot;repos_url&quot;: &quot;&quot;,
          &quot;events_url&quot;: &quot;&quot;,
          &quot;received_events_url&quot;: &quot;&quot;,
          &quot;type&quot;: &quot;User&quot;,
          &quot;site_admin&quot;: false
       }
      }
    ]
  </code></pre>
  <p>There are about 70 results returned and i need it to do this for each one. None of them have a higher level key, so I thought it was that, but everything I've tried seems to throw a <strong>&quot; is invalid because Specification not valid for the selected transformation</strong></p>