message: notes updates
diff: # Implementation notes for pgsearch refactor
  -1. Rename `_client` in hub/indexers
  2. Delete the no-op `_logicalFieldToES` in DocumentContext.
  3. Refactord cardstack_pristine, cardstack_references, etc, out of searchDoc.
  4. When we invalidate documents, we're feeding post-processed ones back into the indexing process. We will need to strip off computed properties, etc, there. For now it's possible they would persist.
  4.5 The `read` method in branch update should get smarter.
  5. verify cursor behavior in docsThatReference (either manually or write a test)
  6. Improve DI system to remove hack where we do require.resolve during injections.
  -7. Drop queryFieldName and querySortName?
  +7. Drop: queryFieldName, querySortName, defaultMapping, queryTermFormatter, customAnalyzer, sortFieldName
  8. Switch filter default from non-exact to exact.
  9. Drop implicit "any" array support inside operators like 'exact'
  10. Clean up leftover API on field-type plugins.
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