An unknown error occurred sending a bulk request

[lmalossi (Luca Malossi)]

Hi,
after upgrading logstash to 5.6.3 I'm getting the following error. I'm using JDBC Plugin

[2017-10-20T10:43:10,868][ERROR][logstash.outputs.elasticsearch] An unknown error occurred sending a bulk request to Elasticsearch. We will retry indefinitely {:error_message=>"""\xCE"" from ASCII-8BIT to UTF-8", :error_class=>"LogStash::Json::GeneratorError", :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/json.rb:52:in jruby_dump'", "/usr/share/logstash/logstash-core/lib/logstash/json.rb:49:in jruby_dump'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client.rb:115:in bulk'", "org/jruby/RubyArray.java:2414:in map'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client.rb:114:in bulk'", "org/jruby/RubyArray.java:1613:in each'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/http_client.rb:113:in bulk'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/common.rb:221:in safe_bulk'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/common.rb:119:in submit'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/common.rb:87:in retrying_submit'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.4.2-java/lib/logstash/outputs/elasticsearch/common.rb:38:in multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/output_delegator_strategies/shared.rb:13:in multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/output_delegator.rb:49:in multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:434:in output_batch'", "org/jruby/RubyHash.java:1342:in each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:433:in output_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:381:in worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:342:in start_workers'"]}