Where can I find history of explanation for shard allocation?


Since the upgrade to Elasticsearch 5.0 we are seeing a lot of movement of shards. In fact, at times there are node_failed exceptions received, but the node seems to be healthy and running elasticsearch correctly. There are spikes in indexing latencies seen at these moments. To investigate the same issue, I was trying to see the reason why Elasticsearch performed so many shard movements but couldn't find a relevant log message. The nodes data nodes are m4.2xlarge and masters are t2.medium.
I know Monitoring does show the history of shard allocation movements, but it doesn't tell the reason why the allocations occured.

(system) #2

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