title: Firebase warning: Using an unspecified index
body: <p>I get this warning message from Firebase for every single <code>orderByChild</code> I used in my queries from JavaScript:</p>
  
  <blockquote>
    <p>FIREBASE WARNING: Using an unspecified index. Consider adding ".indexOn": "" at /tables to your security rules for better performance</p>
  </blockquote>
  
  <p>So far my queries ran quite fast so I think it is not necessary to include the <code>indexOn</code>. Just wondering what are the negative impacts?</p>
  
  <p>Also, how do I actually disable the warnings as they are quite irritating when I am debugging. </p>