title: Firebase Firestore Get all document where array contains
body: <p>How would I query into Firestore to get all documents where an array contains a certain string?</p>
  
  <p>For example my structure is...</p>
  
  <pre><code>/locations
      /{locationId}
            name:"Name of Location"
            description:"Description of Location"
            /lists
                 0:"bigList"
                 1:"smallList"
                 2:"mediumList"
  </code></pre>