All tests pass as of version 8cfa04cea3bc2317ee613384ced4da20cf2737aa on 2010-04-04: http://github.com/elasticsearch/elasticsearch/commit/8cfa04cea3bc2317ee613384ced4da20cf2737aa
Updated the API to take into account ElasticSearch's change from using camelCase to underscore_separators
create() now uses the /_create postfix instead of op_type=create, although that flag is still available through index() and set()
Changed more_like_this and more_like_this_field to mlt and mlt_field
Changed fuzzy_like_this and fuzzy_like_this_field to flt and flt_field
Changed term() to use gt/gte/lt/lte instead of from/to and fromInclusive/toInclusive
put_mapping now defaults to { ignore_conflicts => 0 }, so the default now is to complain
In mlt, boost_terms:boolean and boost_terms_factor:float have now been merged to boost_terms:float