I haven't used Puppet Enterprise before, but the question of how to define parameters as hashes seems to be a [common](https://groups.google.com/forum/#!topic/puppet-users/j8Jk6SU3uzs) [problem](https://ask.puppet.com/question/19106/how-do-you-set-class-parameter-values-to-multidimensional-arrays-in-pe/). Based upon what I've been reading, it seems that hashes need to be either passed in just in curly braces or possibly backticks (I've read conflicting reports).

Thus it seems like one of these might work:

    { 'es-01' => { } }


    `{ 'es-01' => { } }`