I am using
curl -H "Content-Type: application/x-ndjson" -XPOST http://192.168.1.102:9200/myindex/mytype/_bulk --data-binary @file command to import json file into ES cluster.
my master nodes contains : [192.168.1.101, 192.168.1.102, 192.168.1.103]
my data nodes contains: [192.168.1.105, 192.168.1.106, 192.168.1.107, 192.168.1.108].
the master log shows here:
failed to excute on node [YK3h1SM5SZW2K-JloBdVCg] org.elasticsearch.transport.ReceiveTimeoutTransportException: [data5][192.168.1.108:9300][cluster:monitor/nodes/stats[n]] request_id  timed out after [15001ms] at org.elasticsearch.transport.TransportService$TimeoutHandler.run(TransportService.java:982) ... ... Received response for a request that has timed out, sent [25237ms] ago, timed out  ago, action [cluster: monitor/nodes/stats[n]], node
THE EXCEPTIONS are random appearance, sometimes it can process success and es cluster is GREEN , sometimes some of my data nodes get crashed.
I am not sure it appeared because of low memory ,as I use
free -lh to show the memory status ,found only 200MB FREE (total 64GB)
Anybody could give me some hints?