Im Using logstash 2.2 . Im getting below logs

Elastic Stack Logstash
1

"/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-2.5.1-java/lib/logstash/outputs/elasticsearch/http_client.rb:60:in start_sniffing!'", "org/jruby/ext/thread/Mutex.java:149:insynchronize'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-2.5.1-java/lib/logstash/outputs/elasticsearch/http_client.rb:60:in start_sniffing!'", "org/jruby/RubyKernel.java:1479:inloop'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-2.5.1-java/lib/logstash/outputs/elasticsearch/http_client.rb:59:in `start_sniffing!'"], :level=>:error}

2

Providing your config would be helpful.