my Kibana worked without issues for a while but started displaying "No monitoring data found" error today, then Status turned to RED on Kibana. I executed _cluster/health command on the servers, but all status were GREEN. I checked via _cat API but all .monitoring* indices are existed.
why is this happened? why kibana suddenly not able to find .monitoring* indices? why Status'es are different btw kibana and actual servers?
Did you restarted your Elasticsearch then it was resolved?
I tracked myself with all nodes log files. It looked my warm nodes used all heap memory which i set. L related logs i found were shown as below link.
I guess .monitoring indices were not able to be updated from warm nodes after that happened, then my kibana was ahown above error. Weird thing was kibana displayed Status:RED after that even though _cluster/health execution result via each actual nodes were still Status:green.
I decided to restart warm nodes, then issue was gone.
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