# \[logstash.outputs.elasticsearch\] An unknown error occurred sending a bulk request to Elasticsearch

**URL:** <https://discuss.elastic.co/t/logstash-outputs-elasticsearch-an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/145435>\
**Category:** Logstash\
**Created:** [August 21, 2018, 5:10pm UTC](https://discuss.elastic.co/t/logstash-outputs-elasticsearch-an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/145435 "2018-08-21T17:10:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![perryparktung](https://avatars.discourse-cdn.com/v4/letter/p/d78d45/32.png) [@perryparktung](https://discuss.elastic.co/u/perryparktung)\
**Post date:** [August 21, 2018, 5:10pm UTC](https://discuss.elastic.co/t/logstash-outputs-elasticsearch-an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/145435/1 "2018-08-21T17:10:25Z")

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Hi,

I am getting below error when starting Logstash.  
I tried restarting Elasticsearch then Logstash, but still have such issue. Please advise cause of it. Thanks!

`[2018-08-21T11:54:17,570][ERROR][logstash.outputs.elasticsearch] An unknown error occurred sending a bulk request to Elasticsearch. We will retry indefinitely {:error_message=>"", :error_class=>"LogStash::Json::GeneratorError", :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/json.rb:28:in`jruby\_dump'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/http\_client.rb:115:in `block in bulk'", "org/jruby/RubyArray.java:2486:in`map'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/http\_client.rb:115:in `block in bulk'", "org/jruby/RubyArray.java:1734:in`each'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/http\_client.rb:113:in `bulk'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:232:in`safe\_bulk'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:118:in `submit'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:86:in`retrying\_submit'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:34: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:481:in`block in output\_batch'", "org/jruby/RubyHash.java:1343:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:480:in`output\_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:430:in `worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385:in`block in start\_workers'"]}`

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<div class="post-metadata">

**Author:** ![perryparktung](https://avatars.discourse-cdn.com/v4/letter/p/d78d45/32.png) [@perryparktung](https://discuss.elastic.co/u/perryparktung)\
**Post date:** [August 21, 2018, 9:25pm UTC](https://discuss.elastic.co/t/logstash-outputs-elasticsearch-an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/145435/2 "2018-08-21T21:25:20Z")

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Figured. in the logstash config file I used "copy" function under "mutate", while I actually need to use "add\_field" function.  
details in [LogStash::Json::GeneratorError when using mutate copy @timestamp](https://discuss.elastic.co/t/logstash-json-generatorerror-when-using-mutate-copy-timestamp/119256)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 18, 2018, 9:38pm UTC](https://discuss.elastic.co/t/logstash-outputs-elasticsearch-an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/145435/3 "2018-09-18T21:38:23Z")

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