[core] add best_compression option for Lucene 5.0

Upgrades lucene to latest, and supports the BEST_COMPRESSION parameter
now supported (with backwards compatibility, etc) in Lucene.
This option uses deflate, tuned for highly compressible data.

index.codec::
The default value compresses stored data with LZ4 compression, but
this can be set to best_compression for a higher compression ratio,
at the expense of slower stored fields performance.

IMO its safest to implement as a named codec here, because ES already
has logic to handle this correctly, and because its unrealistic to have
a plethora of options to Lucene's default codec... we are practically
limited in Lucene to what we can support with back compat, so I don't
think we should overengineer this and add additional unnecessary plumbing.

See also:
https://issues.apache.org/jira/browse/LUCENE-5914
https://issues.apache.org/jira/browse/LUCENE-6089
https://issues.apache.org/jira/browse/LUCENE-6090
https://issues.apache.org/jira/browse/LUCENE-6100

Closes #8863