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Re:MongoDB Is Raising Another $100M by brickcap on Friday January 09, 2015 @10:38PM (#8865819)
Yeah it was a bit confusing for me too initially but if anyone else still does not know the answer to this it is:-

1. Indexes are built and appended to at read time.

2. If you change the view code an index rebuilding will occur. (A hash of all the views in the design document is taken and compared with the previous hash. So even a small thing such as adding a space will in effect change the view code and trigger rebuilding of views.)

3. No change to any other part of design document will have any effect on views.

I wrote in detail about it here (http://staticshin.com/programming/does-updating-a-design-doc...)

Re:MongoDB Is Raising Another $100M by conorgil145 on Saturday January 10, 2015 @12:25AM (#8866010)
Great write up! Thanks for sharing
Re:MongoDB Is Raising Another $100M by brickcap on Saturday January 10, 2015 @04:17AM (#8866367)
Glad you liked it :)