So the indexing of network attached drives is disabled by default on Macs now.

 

To enable spotlight indexing on a network drive:

 

mdutil /Volumes/name -i on

 

To disable the indexing of a connected network drive:

 

mdutil /Volumes/name -i off

 

To check the status of indexing on a connected network drive:

 

mdutil /Volumes/name –s