Kibana interfaces took lots of time, restart the instance verything works fine

Hi All,
My elasticsearch environment is

apt list elasticsearch kibana filebeat auditbeat metricbeat
Listing... Done
auditbeat/stable,now 7.4.2 amd64 [installed]
elasticsearch/stable,now 7.4.2 amd64 [installed]
filebeat/stable,now 7.4.2 amd64 [installed]
kibana/stable,now 7.4.2 amd64 [installed]
metricbeat/stable,now 7.4.2 amd64 [installed]

In my system I have maximum 7 or 8 system to be monitoring, I have decent elasticsearch server configuration, and my resource I find it is underused most of the time , so my hardware configuration is fine

Now every day I find after some time of usage by kibana web interface, takes longer time to display the hostdetails,
It gives this messages

Your visualization has error(s)
Data Fetch Failure
Request Timeout after 30000ms
"Your visualization has error(s)" + "Data Fetch Failure" + "Request Timeout after 30000ms"

then I do restart my entire OS, then it works

What may he the reason behind this behaviour ?

My hardware details are

root@apmserver:~# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 2
Socket(s): 2
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 26
Model name: ** Intel(R) Xeon(R) CPU E5520 @ 2.27GHz**

free -m

Mem total used free shared buff/cache available
Mem: 16040 3134 10517 13 2388 12593
Swap: 4095 0 4095

thanks
Joseph John

Hello @Joseph_John

Can you provide kibana and elasticsearch logs recorded when the error occurred? I'd like to figure out what request is timing out like that.

Thanks,
Matt

Thanks Mark,
now I do not have the logs, I was trying out in a lab, exploring ELK, what I did when it was taking too much time I did reinstall, since it was not for production.
Next time I see such behavior, I will post the logs with tagging this thread
thanks for reaching out
Joseph John