title: Firstore create multiple documents at once
body: <p>I have given an array of document <strong>id's</strong> which I want to add to Firestore.</p>
  
  <pre><code>let documentIds = [
    'San Francisco',
    'New York',
    'Las Vegas'
  ]
  </code></pre>
  
  <p>Each document should have a predefined set of properties.</p>
  
  <pre><code>let data = {
    country: 'US',
    language: 'English'
  }
  </code></pre>
  
  <p>Is there some function inside the Firebase Admin SDK that can create all documents at once, without iterating through the array of documentIds?</p>