At much lower cost than Apple, with more options.
Lloyd recommends 64GB for iMac or Mac Pro for photography/videography.
How to Exclude Items from Spotlight Search
Last updated September 06, 2010 - Send Feedback
Exclude anything you don’t want indexed (saves time and annoyance).
See Optimizing Spotlight.
The last thing I want is for Spotlight (“mds”) to interfere with my work by indexing my fast Scratch volume, my Time Machine backup slowed to a crawl, etc. Exclude such things.