Version 2.2.4-release, 11 sep 2014

added ALTER RTINDEX rt1 RECONFIGURE which allows to change RT index settings on the fly
added SHOW INDEX idx1 SETTINGS statement
added ability to specify several destination forms for the same source wordform (as a result, N:M mapping is now available)
added blended chars support to exceptions

added ANY()/ALL()/INDEXOF() support for JSON string arrays
added FACTORS() alias for PACKEDFACTORS() function
added LIMIT clause for the FACET keyword
added JSON-formatted output to PACKEDFACTORS() function
added #1999 ATAN2() function
added connections counter and also avg and max timers to agent status
added searchd configuration keys agent_connect_timeout, agent_query_timeout, agent_retry_count and agent_retry_delay
GROUPBY() function now returns strings for string attributes

fixed #2027, slow queries to multiple indexes with large kill-lists
fixed #2022, blend characters of matched word must not be outside of snippet passage
fixed #2021, output units in GEODIST() function
fixed #2018, different wildcard behaviour in RT and plain indexes
fixed #2005, aggregate functions improperly calculate aliased expressions
fixed #1972, daemon crashes trying to read a big (>8G) .spm file
fixed #1966, INTERVAL() function does not work with JSON fields
fixed #1963, GROUPBY() on JSON attributes sometimes yields NULL
fixed GROUPBY() on empty JSON arrays to return NULL instead of []
fixed buffer overrun when sizing packed factors (with way too many fields) in expression ranker
fixed cpu time logging for cases where work is done in child threads or agents