title: How many reads in Firestore am I performing?
body: <p>Say I have a collection called <code>text_messages</code> in firestore that has 500 documents in it, and I know the doc_id of one of those documents.</p>
  <p>I want to execute the following code to fetch the data of that document down:</p>
  <pre><code>doc = db.collection(&quot;text_messages&quot;).document(&quot;my_doc_id&quot;).get()
  data = doc.to_dict()
  </code></pre>
  <p>So my question is this: does this count as 1 read or 500 reads? I'm asking from a billing standpoint and want to optimize cost.</p>