Logstash output plugin kafka is not pushing data into kafka

Elastic Stack Logstash
3

After updating all logstash plugins
now i am seeing following logs

[2017-10-18T19:55:36,794][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>6, :failures=>6, :sleep=>0.01}
[2017-10-18T19:56:06,901][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>1, :failures=>1, :sleep=>0.01}
[2017-10-18T19:56:06,903][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>3, :failures=>3, :sleep=>0.01}
[2017-10-18T19:56:06,905][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>5, :failures=>5, :sleep=>0.01}
[2017-10-18T19:56:06,910][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>6, :failures=>6, :sleep=>0.01}
[2017-10-18T19:56:37,019][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>1, :failures=>1, :sleep=>0.01}
[2017-10-18T19:56:37,029][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>5, :failures=>5, :sleep=>0.01}
[2017-10-18T19:56:37,031][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>3, :failures=>3, :sleep=>0.01}
[2017-10-18T19:56:37,031][INFO ][logstash.outputs.kafka   ] Sending batch to Kafka failed. Will retry after a delay. {:batch_size=>6, :failures=>6, :sleep=>0.01}