logstash-plugins/logstash-filter-fingerprint — pull request #1 by wiibaa (2014-11-03 05:15:40+00:00)
Title: Raise configuration error in fingerprint#register when key is missing

Issue a LogStash::ConfigurationError from register method of fingerprint filter when key parameter is required for selected method instead of a simple error log.
Contribute to LOGSTASH-2240,
the needed enhancement of the doc remains open
Comes from elasticsearch/logstash/pull/1416