Return to elastic search test

Undo all test changes in the generator and other parts of the test except for
the test name to match the elastic search test again. This allowed the model.clj
file to return to its original state.
Implement proper read for client

The read operation needs to return a set of all the added values. The old read
operation was looking to read just one key and return its value. The new behavior
matches the behavior of the elasticsearch set client read as close as possible.