Elasticsearch Indexing Issues

Elastic Stack Elasticsearch
1

Hi,
We have a 5-node cluster, currently running ES 5.6.11. When there's an increased load in indexing, heap usage reaches 90% in one of the nodes, while some have only 40-50% heap usage. Because of this, elasticsearch takes 70-80 seconds sometimes to index even 5-10 documents. We don't make the thread sleep after every bulk indexing. I am attaching a screenshot of heap, CPU & disk usage. Is there any way we can mitigate this issue? We have CMS GC as that is the only one supported in ES 5.6.11.

Screenshot from 2023-03-01 19-34-41
Screenshot from 2023-03-01 19-34-411154×550 29.9 KB

Is there any way to make the indexing faster? Our search is working just fine, as due to the index heavy load, we have increased refresh_rate to 2s. Only indexing is causing issues now.

PS: 2nd Row is the current Master Node, with 75% heap usage

2

Please note that version is very much EOL and no longer supported, you should be looking to upgrade as a matter of urgency. As such you are unlikely to get a resolution here other than to upgrade.

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