Storage execution has added temporary placeholder javascript code via $function to implement bucket unpacking to power the timeseries view. When the DocumentSource $unpackBucket stage is ready, we need to replace the $function code here with $unpackBucket. When doing this work please also be mindful that we will need to read the user-defined timeField and metaField from the view catalog and populate inputs to the $unpackBucket stage. 

We are also wondering if we actually need to implement parsing here. Is it possible to inject this stage somewhere in the view resolution pipeline.