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      Upgrade to Lucene 4.9

      Lucene Change Log

      http://lucene.apache.org/core/4_9_0/changes/Changes.html#v4.9.0.new_features

      Highlights:

      New Terms.getMin/Max methods to retrieve the lowest and highest terms per field.

      New IDVersionPostingsFormat, optimized for ID lookups that associate a monotonically increasing version per ID.

      Atomic update of a set of doc values fields.

      Numerous optimizations for doc values search-time performance.

      New (default) Lucene49NormsFormat to better compress certain cases such as very short fields.

      New SORTED_NUMERIC docvalues type for efficient processing of multi-valued numeric fields.

      Indexer passes previous token stream for easier reuse.

      MoreLikeThis accepts multiple values per field.

      All classes that estimate their RAM usage now implement a new Accountable interface.

      Lucene files are now written by (File)OutputStream on all platforms, completely disallowing seeking with simplified IO APIs.

      Improve the confusing error message when MMapDirectory cannot create a new map.

      Especially, the spatial module integrated with spatial4j.

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            • Assignee:
              support-lep@liferay.com SE Support
              Reporter:
              jonas.yuan Jonas Yuan
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