Is there a way to show Spotlight indexing status/progress in Yosemite?
From this page
Show the status of Spotlight indexing for a volume
mdutil -s /Volumes/volumename
↪︎
/Volumes/volumename:
Indexing enabled.
Here are some other Spotlight terminal commands
This comment thread suggests that there is not a great way to get an estimated time to completion.
type "indexing" into spotlight and the progress bar shows up as the first result.