Though this is similar to SERVER-60721 (which targets a specific benchmark targeting 3 arrays that has since been resolved), we would like to investigate array traversal further. In particular, we are interested to know how performance scales as a function of array size.
Note that we have a wildcard index benchmark (Queries.WildcardIndex.PointQueryOnTwoArrayFields.Baseline) that tests this that we should verify has gone away as part of this ticket.