0.17.5: zip / tar.gz / issues

Release Notes:

Mapping: Allow to enable automatic numeric types detection new fields with a string value (#1233)

Invalidate cache stats when clearing the cache (#1220)
Allow setting _index and _type with CouchDB river (#1219)
Store/index content type (#1209)
Improve how versioning are read to reduce (deleted) open file handles (#1230)
Highlighting: For fast term vector highlighting, allow to control the fragment offset (#1223)

Rare deadlock when introducing new mapping fields/objects (#1222)
When flushing, old transaction log is not removed (#1180)
Full field paths not respected in sort parameters (#1226)
Failed shard recovery can cause shard data to be deleted (replicas will still work) (#1227)
Java API TransportClient can fail on remote node shutdown instead of retrying the next connected node under heavy load (#1229)
Failure to reduce geo distance sorting (class case exception) (#1234)
Updating index.auto_expand_replicas might not be applied correctly (#1237)
Peer recovery process can sometimes not reuse the same index files allocated on a possible node (#1238)
CouchDB River: Custom script does not convert the modified doc properly to be indexed (#1225)
Scripts: arrays: “.multiValued” returns true even when “.values” fails (#1145)
Thrift Transport: Uses wrong array offset into the underlying buffer (#1232)