Skip missing fields, as converting those introduces new fields.
Explicitly specify fields to be ignored for GELF.
Add parameter to select the field that provides the GELF short message.
Fix spacing.
Add `short_message` to the list of fields to be ignored for GELF.
fixed index variable parsing 
Support deep fields (foo.bar) in date filter (LOGSTASH-724)
Support deep fields (foo.bar) in date filter (LOGSTASH-724)
allow literal dot with \.
Update lib/logstash/outputs/elasticsearch_river.rb
updated changelist for fix for LOGSTASH-819
Update CHANGELOG
Merge pull request #302 from paulczar/master

improve outputs / elasticsearch_river
Fixed year pattern.

Year was matching any digit, one or more times. This could lead to way
too eager matching.

Match years as either a group of 2, or a group of 4 digits.
-
- don't use "puts", use logger.debug (LOGSTASH-832)
Merge pull request #308 from cnf/yearfix

Fixed year pattern.
- fix bad 'source' url (LOGSTASH-821, #306)
- 1.1.8 hasn't been released yet
- report the host/port that is related to EADDRINUSE (LOGSTASH-831)
Update changelog