# An unknown error occurred sending a bulk request to Elasticsearch

**URL:** <https://discuss.elastic.co/t/an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/95537>\
**Category:** Logstash\
**Created:** [August 2, 2017, 1:29pm UTC](https://discuss.elastic.co/t/an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/95537 "2017-08-02T13:29:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sadiesh](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sadiesh/32/38868_2.png) [@sadiesh](https://discuss.elastic.co/u/sadiesh)\
**Post date:** [August 2, 2017, 1:29pm UTC](https://discuss.elastic.co/t/an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/95537/1 "2017-08-02T13:29:41Z")

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Am getting following error in logstash. while running a JDBC Plugin

An unknown error occurred sending a bulk request to Elasticsearch. We will retry indefinitely {:error\_message=\>"No serializer found for class java.io.ByteArrayInputStream and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL\_ON\_EMPTY\_BEANS) ) (through reference chain: oracle.sql.INTERVALDS["stream"])", :error\_class=\>"LogStash::Json::GeneratorError", :backtrace=\>["C:/Users/ **_/dev/logstash-5.5.0/logstash-core/lib/logstash/json.rb:52:in `jruby_dump'", "C:/Users/***** /dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/http_client.rb:116:in`bulk'", "org/jruby/RubyArray.java:2414:in `map'", "C:/Users/ *****/dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/http_client.rb:115:in`bulk'", "org/jruby/RubyArray.java:1613:in `each'", "C:/Users/***** /dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/http_client.rb:114:in`bulk'", "C:/Users/_ **/dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/common.rb:225:in `safe_bulk'", "C:/Users/***** /dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/common.rb:123:in`submit'", "C:/Users/ **_/dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/common.rb:91:in `retrying_submit'", "C:/Users/***** /dev/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-7.3.6-java/lib/logstash/outputs/elasticsearch/common.rb:42:in`multi\_receive'", "C:/Users/_ **/dev/logstash-5.5.0/logstash-core/lib/logstash/output\_delegator\_strategies/shared.rb:13:in `multi_receive'", "C:/Users/***** /dev/logstash-5.5.0/logstash-core/lib/logstash/output_delegator.rb:47:in`multi\_receive'", "C:/Users/ **_/dev/logstash-5.5.0/logstash-core/lib/logstash/pipeline.rb:420:in `output_batch'", "org/jruby/RubyHash.java:1342:in`each'", "C:/Users/_** /dev/logstash-5.5.0/logstash-core/lib/logstash/pipeline.rb:419:in `output_batch'", "C:/Users/ ***** /dev/logstash-5.5.0/logstash-core/lib/logstash/pipeline.rb:365:in`worker\_loop'", "C:/Users/\*\*\*\*\*/dev/logstash-5.5.0/logstash-core/lib/logstash/pipeline.rb:330:in `start\_workers'"]}

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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:** [August 30, 2017, 1:29pm UTC](https://discuss.elastic.co/t/an-unknown-error-occurred-sending-a-bulk-request-to-elasticsearch/95537/2 "2017-08-30T13:29:51Z")

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