title: How to search for a list of maps in dynamodb using boto3
body: <p>With the json below in dynamodb how would I search any item where <code>session.id == "12ghbcyg"</code> using <code>boto3</code> in python?</p>
  
  <pre><code>{
      "name": "John",
      "sessions": [
          {
              "id": "12ghbcyg",
              "foo": "bar"
          }
      ]
  }
  </code></pre>