Relase Notes

Breaking changes:

Blank routing should be ignored (#1450)
Highlighting on term vector enabled field should not highlight filters by default (#1469)
Date Range: Inclusive upper range does not round up properly (#1463)

AbstractCompoundWordTokenFilterFactory should store the dictionary as a CharArraySet instance, not a Set (#1449)
XContentBuilder to handle extended classes of java.util.Date (#1465)
Mapping: Improve applying guessed types on dynamic templates (#1446)

data.path locations are unevenly filled (0.18.2) (#1436)
Percolate / Analyzer API can hang if it fails to execute (#1457)
Using root object level mapping (_size, _source) can cause reparsing of the mapping on startup (#1458)
Nested facet execution can fail with ArrayIndexOutOfBounds (#1467)
Inner queries not resolved correctly in has_child filter when searching directly against the parent type (in the URI for example) (#1471)
Couchdb River: since changes parameter (seq) is not url encoded (#1470)
Indices Stats API: Providing groups as part of the HTTP API does not return stats for those groups (#1468)
Search: Search requests execute by mistake on the networking http IO thread, causing other http operations to hang (#1455)