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Search requirements: 

• https://github.com/samvera/valkyrie/wiki/Queries
• https://docs.google.com/document/d/1JYHog_t0Ye6VXg3i1MyTqMQZW40HsEdpme8RjFE-iys/edit#
• https://docs.google.com/document/d/13C_UhB37docTd8ZTD1ZSKuFhX6q9_3Boo67hjUC2YyM/edit

1. Question consistency is required?  In other words, should the client be able to perform queries immediately after updating a resource and expect to see the previously committed changes?  I think yes
2. Use cases:
   1. Get child resources.
   2. Get 

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