title: How to know if firebase database index working?
body: <p>I added index to firebase database but I don't know how it works and is it working?
  I indexed on SearchName which is one level down.</p>
  
  <p>Peoples>$uid>SearchName</p>
  
  <pre><code>    {
    "rules": {
      ".read": "auth != null",
      ".write": "auth != null",
      "Data": {
         "All": {
          "Peoples": {
            ".indexOn": ["SearchName"]
          },
          "Schools": {
            ".indexOn": ["SearchName"]
          } 
        }
      }
    }
  }
  </code></pre>