I open up Kibana and seeing following message:
Login is currently disabled. Administrators should consult the Kibana logs for more details.
in elasticsearch's log, I found following:
elasticsearch | [2018-02-16T16:04:41,915][WARN ][o.e.x.m.e.l.LocalExporter] unexpected error while indexing monitoring document elasticsearch | org.elasticsearch.xpack.monitoring.exporter.ExportException: RemoteTransportException[[esd5][10.0.0.16:9300][indices:data/write/bulk[s]]]; nested: CircuitBreakingException[[parent] Data too large, data for [<transport_request>] would be [24649591028/22.9gb], which is larger than the limit of [24001537638/22.3gb]];
elasticsearch | [2018-02-16T16:12:26,944][ERROR][o.e.x.s.a.e.ReservedRealm] [elasticsearch111] failed to retrieve password hash for reserved user [elastic] elasticsearch | org.elasticsearch.transport.RemoteTransportException: [esd2][10.0.0.58:9300][indices:data/read/get[s]] elasticsearch | Caused by: org.elasticsearch.common.breaker.CircuitBreakingException: [parent] Data too large, data for [<transport_request>] would be [24478281946/22.7gb], which is larger than the limit of [24001537638/22.3gb]