RequestAbortedError on bulk indexing happens randomly

Elastic Stack Elasticsearch
1

I use the bulk api to index fairly large objects. My indexing cronjob runs every 30 seconds which will index any objects updated in the last 30 seconds. I have another cronjob that runs at midnight which updates alot of data. During this time I get RequestAbortedError on datadog. What could be the reason for this?
The statusCode returned in 0
The error log looks like below

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image1716×1096 72.5 KB

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2

I just checked the CPU / Memory usage of ES when the errors occurred, and it looks like the CPU usage goes 100% only in one of the nodes in that period

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image2422×1142 281 KB

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