By default, Spotlight indexes local drives. However it is possible to force it to index networked AFP (Apple File Protocol) volumes as well.

Open Terminal, and type

sudo bash

It will ask for your password.

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Posted by ellen at September 02, 2011 11:09 PM Then at the bash prompt, enter

mdutil /Volumes/AFPvolumename -i on

mdutil /Volumes/AFPvolumename -s

(replace AFP volumename with the name of the drive you want to index. Many thanks to sowattmusic for this tip.

References

Forum post on Indexing a network drive with Spotlight