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The Collector interface replaces HitCollector in Lucene 5.0.  Given that much of the current HitCollector implementation is tied to the boundary doc implementation and the single index requirement to filter for a given coding scheme, custom HitCollectors or Collectors may no longer be necessary using a standard implementation of TopScoreDocsCollector.  We show a provisional implementation of Simple Search Extension here, which may be required if we cannot get the global searches of all Common Indexes to run quickly enough.  This will require implementation of a new Filter/Collector or Facet combination to sort out the portion of the indexes pertaining to a given coding scheme.

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