Using get_records to get one item for each value of a metadata field

Hello.

I have a metadata field ‘elements’ that has about 80 unique values. I want to get one item for each of these values, so my query should give me 80 results with each one having a distinct ‘elements’ value.

Can this be done using get_records? Unfortunately the documentation for this function is pretty sparse: http://omeka.readthedocs.io/en/latest/Reference/libraries/globals/get_records.html

Thanks!