LUCENE-5339: make branch

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LUCENE-5339: current patch

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LUCENE-5339: add abstract Facets base class; fix separate test failure

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eclipse rename

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LUCENE-5339: add nocommits

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LUCENE-5339: cutover DrillSideways

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LUCENE-5339: update TODOs

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LUCENE-5339: add OrdinalsReader + Cache to abstract the source of the ords

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LUCENE-5339: simplify DrillDownQuery

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LUCENE-5339: remove delim char

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LUCENE-5339: assocations

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LUCENE-5339: renames

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LUCENE-5339: add base class for taxo facet impls; catch wrong index field name for a given dim

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LUCENE-5339: renames

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LUCENE-5339: migrate some more tests; fix 'ignores IntsRef.offset bug' in TaxoFacetCounts; add FacetTestCase.getFacetCounts

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LUCENE-5339: switch to DocumentBuilder.build instead of FacetIndexWriter

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LUCENE-5339: add best-effort detection of invalid mixing of different association field types in single indexed field

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LUCENE-5339: another test, cutover taxo writer/reader to pathToString/stringToPath

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LUCENE-5339: more tests, add DimConfig.requireDimCount

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LUCENE-5339: cutover more tests; fixed a few bugs

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