• LogMergePolicy now triggers merges if the ratio of deleted documents reaches a threshold (@shikhar @fulmicoton) #115
• Adds a searcher Warmer API (@shikhar @fulmicoton)
• Change to non-strict schema. Ignore fields in data which are not defined in schema. Previously this returned an error. #1211
• Facets are necessarily indexed. Existing index with indexed facets should work out of the box. Index without facets that are marked with index: false should be broken (but they were already broken in a sense). (@fulmicoton) #1195 .
• Bugfix that could in theory impact durability in theory on some filesystems #1224
• Schema now offers not indexing fieldnorms (@lpouget) #922
• Reduce the number of fsync calls #1225
• Fix opening bytes index with dynamic codec (@PSeitz) #1278
• Added an aggregation collector compatible with Elasticsearch (@PSeitz)
• Added a JSON schema type @fulmicoton #1251
• Added support for slop in phrase queries @halvorboe #1068