Hello,
I think I have the same problem. I use filebeat as log provider ( this is installed on windows server), then logstash receive these logs and make them as json and save them to elasticsearch. after few days, 2-7, it stops with this error message (logging is in debug). ELK is installed into redhat server. Every time after I start logstash everything works well. Any idea about this issue?
{:timestamp=>"2016-02-09T11:37:11.055000+0200", :message=>"Flushing buffer at interval", :instance=>"#<LogStash::Outputs::ElasticSearch::Buffer:0x5dd2bac @operations_mutex=#<Mutex:0xb1ac567>, @max_size=500, @operations_lock=#<Java::JavaUtilConcurrentLocks::ReentrantLock:0xf2540dc>, @submit_proc=#<Proc:0x26cb0dff@/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-2.1.4-java/lib/logstash/outputs/elasticsearch/common.rb:54>, @logger=#<Cabin::Channel:0x7b27c5bc @metrics=#<Cabin::Metrics:0x5e2159a4 @metrics_lock=#<Mutex:0x2a083013>, @metrics={}, @channel=#<Cabin::Channel:0x7b27c5bc ...>>, @subscriber_lock=#<Mutex:0x54d27458>, @level=:debug, @subscribers={12450=>#<Cabin::Outputs::IO:0x4525d6a5 @io=#<File:/var/log/logstash/logstash.log>, @lock=#<Mutex:0x2e46eeba>>}, @data={}>, @last_flush=2016-02-09 11:37:09 +0200, @flush_interval=1, @stopping=#<Concurrent::AtomicBoolean:0x69712f9e>, @buffer=[[\"index\", {:_id=>nil, :_index=>\"logstash-2016.02.09\", :_type=>\"log\", :_routing=>nil}, #<LogStash::Event:0x1acbac8d @metadata_accessors=#<LogStash::Util::Accessors:0x629ca0da @store={\"beat\"=>\"st\", \"type\"=>\"log\"}, @lut={\"[beat]\"=>[{\"beat\"=>\"st\", \"type\"=>\"log\"}, \"beat\"]}>, @cancelled=false, @data={\"LogLevel\"=>\"INFO\", \"StartTime\"=>\"2016-02-09 11:33:59.2459409\", \"ExecutionTime\"=>0, \"CallingMethod\"=>\"InvokeMethod\", \"Correlation\"=>{\"CorrelationId\"=>\"10bd8e73-5975-402f-a0b8-bd5b1fec08fb\", \"SequenceNo\"=>1}, \"Info\"=>{\"Id\"=>1, \"Name\"=>\"GetCurrentInstance\", \"AppGuid\"=>\"93d25489-d02b-4ecc-89e9-6f97e57c3d0c\"}, \"Inputs\"=>\"[]\", \"@version\"=>\"1\", \"@timestamp\"=>\"2016-02-09T09:33:59.459Z\", \"beat\"=>{\"hostname\"=>\"BUHRAPPST01\", \"name\"=>\"BUHRAPPST01\"}, \"count\"=>1, \"fields\"=>nil, \"input_type\"=>\"log\", \"offset\"=>1734196, \"source\"=>\"D:\\\\Logs\\\\Plat_20160209-11.log\", \"type\"=>\"log\"}, @metadata={\"beat\"=>\"st\", \"type\"=>\"log\"}, @accessors=#<LogStash::Util::Accessors:0x395c8202 @store={\"LogLevel\"=>\"INFO\", ...