Elasticsearch not loading logs


We have an elasticsearch cluster in docker swarm that consists of:

3 x controllers
1 x hot node
1 x warm node
1 x cold node

The cluster is showing as healthy and the nodes all have quite low memory/CPU usage however when trying to load logs it takes forever to load and when we get this error

Error: Batch request failed with status 502
    at search_interceptor_SearchInterceptor.handleSearchError

I can see that indexing is happening between the nodes and wondering if that is overloading the cluster as I can see some timeout errors in Kibana, but surely we would see high CPU/mem is this was the case?

Is there anything I can look at to diagnose this issue? Thank you!

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