Updated for ElasticSearch 2.x
Updated for ElasticSearch 5.x
Deleted content (Posts, Profile Posts and Threads) are indexed when doing a full rebuild
New option: "Ignore Serialized Data"
Removed some of the node CPU stats when using version of ElasticSearch that doesn't support those stats
Changed how some classes load for better compatibility with other addons
New analyzer option: Custom stemming analyzer with language (indexes numbers, treats punctuation as stop words)
If optimize mapping fails, show reason in server error log
Node stats included info about index (creation date, analyzer type, tokenizer, language, filters)
Node stats included info about operating system and processors
Changes to better support Elasticseach 1.4.x and higher
Updated for better compatibility with XenForo Enhanced Search 1.1
Force user_ids to be integers (sometimes XenForo passes them as a string)
If you are using XenForo 1.3, the user's email and username *history* become searchable (from change log in XF 1.3).
New option under Search Options... "Index User's Email History" (allows you to disable indexing user's email addresses)
Stats block works with Elastic Search 1.0.0
A few additional stats reported (deleted documents, open file descriptors, processors, Elastic Search version)
No longer need XenForo's cache to have auto_serialization on
Fixed issue with old versions of PHP (5.2/5.3) - no change for PHP 5.4/5.5
Install process utilizes Digital Point Marketplace automated brand removal API (for those with a branding-free license)
Automatically disable conversation searches if Elastic Search isn't installed/enabled.