At one time, adding a the logical `or:` prefix was required when using multiple group_by and filter params. However, this no longer seems to be a requirement. Since logical OR is applied by default, we should be able to remove the logical `or:` prefix.

Instead of something like this:

&filter[or:project]=boston&filter[or:project]=raleigh&filter[or:cluster]=ocp

the params can be simplified as:

&filter[project]=boston&filter[project]=raleigh&filter[cluster]=ocp