Initially, the timeseries support for createIndexes command was implemented by translating the request at the beginning (switching the NSS to the buckets collection + converting the index spec over buckets), with the idea that the remainder of the command can work over the translated version.

However this was problematic because we did a first acquisition to do the timeseries translation, then released and re-acquired it a second time create the indexes, so the collection could be dropped and re-created in between. To fix this, SERVER-104712 unified both acquisitions and introduced an struct to contain the resolved index build request.

With this in place, we should be able to remove the concept of "timeseries-translated request", and instead put the translated index specs directly into the resolved index build request.