logstash/logstash — pull request #432 by piavlo (2013-04-03 18:34:57+00:00)
Title: field_remove option in base filter + fields are arrays only if they have...

base filter can add/remove tags and can add fields with values but cannot remove fields by fieldname
this patch adds :remove_field option and deprecates :remove option of mutate filter

also as discussed previously over irc - single value fields should be strings and not arrays