Document autosuggest approaches, Solr configuration and indexing requirements, and explore how to setup user feedback environment

[hudajkhan]

Based on autocomplete, we explored how to fulfill the auto-suggest designs.

We need to do the following:

• Document the approaches we used.
• If we want to set up an earthworks environment for testing the autosuggest approach
  -- Set up a test Solr core with the configuration we would like to use for testing
  -- Have an EarthWorks app (e.g. staging) point to this test Solr core

See #1047 for reference.