Cant kill it, but sending a shutdown request from elasticsearch (using kopf), made it shutdown.
SIGINT received. Shutting down the pipeline. {:level=>:warn, :file=>"logstash/agent.rb", :line=>"116", :method=>"execute"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x4faa208f dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x5554f7f9 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x2156f7c9 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0xe21f971 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x6bb19e77 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x239e6bfa dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x5e772c0 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x6ff89d06 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x43e1f00 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x584f877a dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x46cc6d2d dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x52a10821 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x3608e5ed dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
Sending shutdown signal to input thread {:thread=>#<Thread:0x3d1cd145 dead>, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"258", :method=>"shutdown"}
May 20, 2015 12:51:18 PM org.elasticsearch.action.admin.cluster.node.shutdown.TransportNodesShutdownAction$NodeShutdownRequestHandler messageReceived
INFO: [logstash-GKKT-SOA-BORG1-10-170-13-20-20430-12728] shutting down in [200ms]
May 20, 2015 12:51:19 PM org.elasticsearch.action.admin.cluster.node.shutdown.TransportNodesShutdownAction$NodeShutdownRequestHandler$1 run
INFO: [logstash-GKKT-SOA-BORG1-10-170-13-20-20430-12728] initiating requested shutdown...
May 20, 2015 12:51:19 PM org.elasticsearch.node.internal.InternalNode stop
INFO: [logstash-GKKT-SOA-BORG1-10-170-13-20-20430-12728] stopping ...
May 20, 2015 12:51:19 PM org.elasticsearch.node.internal.InternalNode stop
INFO: [logstash-GKKT-SOA-BORG1-10-170-13-20-20430-12728] stopped
May 20, 2015 12:51:19 PM org.elasticsearch.node.internal.InternalNode close
INFO: [logstash-GKKT-SOA-BORG1-10-170-13-20-20430-12728] closing ...
May 20, 2015 12:51:19 PM org.elasticsearch.node.internal.InternalNode close
INFO: [logstash-GKKT-SOA-BORG1-10-170-13-20-20430-12728] closed