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spin off from SOLR-1607. To fix ExternalFileField bug described SOLR-1607, I'd propose introducing reloadCache feature over using proper key other than IndexReader.
SOLR-1607 use a proper key other than IndexReader for ExternalFileField and QueryElevationCompenent to work properly when reopenReaders is set to true
SOLR-4085 Commit-free ExternalFileField