2.2.0: put-mapping errors

Elastic Stack Elasticsearch
1

Hi,
I'm seeing the following errors despite there being no issues with shard errors etc:

ProcessClusterEventTimeoutException[failed to process cluster event (put-mapping [app-logs]) within 30s]
        at org.elasticsearch.cluster.service.InternalClusterService$2$1.run(InternalClusterService.java:343)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

some info about our cluster:

2 x master node (4GB Heap/2 x CPU)
4 x data node (8GB Heap/ 4 x CPU)
2 x client node (4GB Heap/2 x CPU)

Index Count: 5
Shard Count: 20
Total Docs: 98 million
Total Storage: 258GB

Failures seem to relate to yesterday's index which is backfilling, probably because of the put-mapping errors. However, I don't see specific shard, index or mapping errors that take me directly to the issue. Would appreciate some help to understand this...

Regards,
D

2

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