create branch

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LUCENE-5178: add 'missing' support to docvalues (simpletext only)

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Merged /lucene/dev/trunk:r1514641-1514711

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bump 4.5 codec

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make 4.2 read only / setup impersonator

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support missing for 4.5 and disk dv

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improve DV faceting tests, support missing count for single valued string fields, remove required/default restriction

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add some sort missing last tests for dv

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move to test-framework (only needed for simulating old codecs which have no concept of missing)

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javadocs/cleanups

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add memorydv with missing support

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add checks

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improve tests

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Merged /lucene/dev/trunk:r1514712-1515613

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beef up tests

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add test

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LUCENE-5182: Terminate phrase searches early if max phrase window is exceeded

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SOLR-5108: fail plugin info loading if multiple instances exist but only one is expected

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beef up TestDuelingCodecs

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LUCENE-3849: end() now sets position increment, so any trailing holes are counted

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