EFK stack in kubernetes cluster

[RogainaAli]

I have deployed (EFK) stack in k8s cluster
fluentd image: fluent/fluentd-kubernetes-daemonset:v1.14.3-debian-elasticsearch7-1.0
elasticsearch operator version: 7.13.2
kibana version: 7.13.2
os version: centos 7

there's an issue in fluentd daemonsets

2022-04-25 18:06:32 +0200 [warn]: #0 [out_es] failed to flush the buffer. retry_times=4 next_retry_time=2022-04-25 18:06:40 +0200 chunk="5dd7cc1395423749cd076a73740c0273" error_class=Fluent::Plugin::ElasticsearchOutput::RecoverableRequestFailure error="could not push logs to Elasticsearch cluster ({:host=>\"enms-es-http.log.svc.cluster.local\", :port=>9200, :scheme=>\"http\", :user=>\"eluser\", :password=>\"obfuscated\", :path=>\"\"}): read timeout reached" 2022-04-25 18:06:32 +0200 [warn]: #0 suppressed same stacktrace

and the size of fluentd index is big from elasticsearch plugin

fluentd-2022.04.25
size: 1.22Gi (2.42Gi)
docs: 6,797,819 (13,477,202)

how to solve this issue?