Nodes fall out of the cluster es 7.9.1

Elastic Stack Elasticsearch
1

Hello, we have the following problem: nodes can periodically fall out of the cluster

[2020-11-19T09:00:37,415][INFO ][o.e.c.s.MasterService    ] [h1-es03] node-left[{h1-es02}{qgmMV2UbT-ScN9uRr6YM8g}{klj1K8UMRHGtYpYozIuqsA}{192.168.57.102}{192.168.57.102:9300}{dimr} reason: followers check retry count exceeded], term: 87,
 version: 236727, delta: removed {{h1-es02}{qgmMV2UbT-ScN9uRr6YM8g}{klj1K8UMRHGtYpYozIuqsA}{192.168.57.102}{192.168.57.102:9300}{dimr}}
[2020-11-19T09:00:39,763][INFO ][o.e.c.s.ClusterApplierService] [h1-es03] removed {{h1-es02}{qgmMV2UbT-ScN9uRr6YM8g}{klj1K8UMRHGtYpYozIuqsA}{192.168.57.102}{192.168.57.102:9300}{dimr}}, term: 87, version: 236727, reason: Publication{term
=87, version=236727}
[2020-11-19T09:00:47,890][INFO ][o.e.c.s.MasterService    ] [h1-es03] node-join[{h1-es02}{qgmMV2UbT-ScN9uRr6YM8g}{klj1K8UMRHGtYpYozIuqsA}{192.168.57.102}{192.168.57.102:9300}{dimr} join existing leader], term: 87, version: 236730, delta:
 added {{h1-es02}{qgmMV2UbT-ScN9uRr6YM8g}{klj1K8UMRHGtYpYozIuqsA}{192.168.57.102}{192.168.57.102:9300}{dimr}}
[2020-11-19T09:00:52,713][INFO ][o.e.c.s.ClusterApplierService] [h1-es03] added {{h1-es02}{qgmMV2UbT-ScN9uRr6YM8g}{klj1K8UMRHGtYpYozIuqsA}{192.168.57.102}{192.168.57.102:9300}{dimr}}, term: 87, version: 236730, reason: Publication{term=8
7, version=236730}

3 nodes in a cluster, each can be a master and is a datanode. Elasticsearch 7.9.1 build opendistro from amazon.
In addition, we write to Elasticsearch using Apache Metron and when we try to write sometimes, we get errors:

java.io.IOException: listener timeout after waiting for [30000] ms
2

Is that the node from the master or the node that dropped out?

FYI odfe is a fork by aws, so it might also be worth asking on their forum.

3

These messages are from the master, and the node-left reason indicates repeated health check failures, but +1 to Mark's FYI: the first thing you should do is to reproduce this with an official build to rule out that it's something that only affects the ODFE fork.