title: NiFi expression language dealing with special characters in JSON keys
body: <p>So I have some json in which the keys might be something like this:</p>
  
  <pre><code>{
      "name" : "John",
      "num:itparams:enterprise:2.0:content" : {
        "housing" : "5"
      },
      "num rooms": "12"
  }
  </code></pre>
  
  <p>I get this json from an http request, and I need to use the evaluateJsonPath processor to create attributes from them. </p>
  
  <p>name is easy, i just use $.name</p>
  
  <p>But how would I access the other two? I imagine you would put them in quotes somehow to escape the special characters but just doing $."num:itparams:enterprise:2.0:content" doesnt work.</p>