Courier fetch: 5 of 1715 shards failed

Elastic Stack Kibana
1

I'm getting following yellow message on top of my Kibana:

Courier fetch: 5 of 1715 shards failed.

probably due to conflict(s) in mapping, is there some way to find anomaly? (which index, so I won't have to reindex everything)

Please advise.

2

Check your Elasticsearch log, it should explain why.

3

I looked on all nodes in my cluster and couldn't find anything unusual mainly INFO, some unrelated WARNs. Do I need to enable specific level to see that information and/or which elasticsearch should I be tailing logs on? I have coordinate elasticsearch node in front of kibana and few master and data nodes and I checked all of them.

4

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