Java Out Of Memory error while indexing data into elasticsearch

Elastic Stack Elasticsearch
1

Hello ,
We are facing Java OOM issue while indexing data into elasticsearch .

We are reading close to 33 million records with 36 columns from Oracle database .We have broken data into 32 threads with every thread loading close to 1 million records .
We are using Bulk API and the bulk size is set to 10000 records .
Here are the details :

JVM heap size : 8 GB .
Java Version:1.6.0_45
JVM: Java HotSpot(TM) 64-Bit Server VM

Appreciate any pointers .

Thanks
Shishir

2

You could either reduce the number of threads or the bulk size?
Also, it sounds like you are using a very old version of elasticsearch as JAVA 1.6 is not supported anymore.

Could you consider upgrading?

3

We are using elastic version 1.1.1
Can you pls suggest which is most stable version I should upgrade to ?

4