StackOverflowError: null and elasticsearch dying

Getting a stack overlow error with elastic search version[6.6.2]

[2019-09-09T04:01:07,798][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [da-data2] fatal error in thread [elasticsearch[da-data2][flush][T#1]], exiting

java.lang.StackOverflowError: null
at org.elasticsearch.common.io.stream.StreamOutput.writeVInt(StreamOutput.java:255) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.ElasticsearchException.writeStackTraces(ElasticsearchException.java:733) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:966) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:964) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.ElasticsearchException.writeStackTraces(ElasticsearchException.java:743) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:966) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:964) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.ElasticsearchException.writeStackTraces(ElasticsearchException.java:743) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:966) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:964) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.ElasticsearchException.writeStackTraces(ElasticsearchException.java:743) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:966) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:964) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.ElasticsearchException.writeStackTraces(ElasticsearchException.java:743) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:966) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.common.io.stream.StreamOutput.writeException(StreamOutput.java:964) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.ElasticsearchException.writeStackTraces(ElasticsearchException.java:743) ~[elasticsearch-6.6.2.jar:6.6.2]

What does your configuration and setup look like? Where are you running this cluster? Which operating system are you using? What type of storage are you using?

We have three data nodes, 160 shards. Running on ubuntu in ec2.

Using EBS storage?

Yes, we are using EBS

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