LUCENE-6033: CachingTokenFilter now uses ArrayList not LinkedList, and has new isCached() method

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SOLR-6684 Fix-up /export JSON

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LUCENE-6060: remove IndexWriter.unlock

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LUCENE-5929: highlight terms from block join queries too

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Remove incorrect prefix on some log messages (merged from r1639382)

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SOLR-6738: Admin UI - Escape Data on Plugins-View (merge r1639383)

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SOLR-6739: Admin UI - Sort list of command line args (merge r1639509)

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SOLR-6740: Admin UI - improve Files View (merge r1639511)

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LUCENE-6057: improve Sort(SortField) docs

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