As part of SERVER-102039 I added a $out test that involves creating a timeseries collection with a collator, dropping the default index that's added on collection creation, and adding an index with the same name before running a $out pipeline. For viewless timeseries, this works as expected. However, with a legacy timeseries collection the $out pipeline fails with the errormessage "Cannot override a view's default collation". I believe this to be unrelated to my changes in $out, but I'm not certain what the expected behavior is here.