title: How to update array element in firestore with golang?
body: <p>Following code:</p>
  
  <pre><code>Lobby := map[string]interface{}{
          "table_id"          :"new table id",
          "Status"            : true,
          "name"              : "shivam",
          "array":[]interface{}{0,1,3},// this replace existing array with new values
      }
  
  result, err := client.Collection("lobbies").Doc("12").Set(ctx,Lobby,firestore.MergeAll)
  </code></pre>
  
  <p>I just want to update 2nd element in array with the new value</p>