Bulk get using objectify?

I am using the Objectify Loader ids method to batch load the ids from the google datastore. But from the Google Cloud Trace logs, I can see that this requests are batched in ids of size 10.

Is there any way to increase this size?

However, if I change the consistency level of objectify to Eventual and then do the batch get, then I only see on get call in trace logs.

Can someone explain this behavior and how to increase the batch get limit?