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Merge pull request #51916 from aknuds1/fix-rbac

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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

fluentd-elasticsearch: Improve README

Improve README of fluentd-elasticsearch add-on.
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cluster/addons/fluentd-elasticsearch/README.md
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@ -8,7 +8,7 @@ is a graphical interface for viewing and querying the logs stored in
Elasticsearch.
**Note:** this addon should **not** be used as-is in production. This is
an example and you should treat is as such. Please see at least the
an example and you should treat it as such. Please see at least the
[Security](#security) and the [Storage](#storage) sections for more
information.
@ -19,9 +19,9 @@ a Deployment, but allows for maintaining state on storage volumes.
### Security
Elasticsearch has capabilities to enable authorization using
Elasticsearch has capabilities to enable authorization using the
[X-Pack plugin][xPack]. See configuration parameter `xpack.security.enabled`
in Elasticsearch and Kibana configurations. It can also be set via
in Elasticsearch and Kibana configurations. It can also be set via the
`XPACK_SECURITY_ENABLED` env variable. After enabling the feature,
follow [official documentation][setupCreds] to set up credentials in
Elasticsearch and Kibana. Don't forget to propagate those credentials also to
@ -31,7 +31,7 @@ and [Secrets][secret] to store credentials in the Kubernetes apiserver.
### Initialization
The Elasticsearch Statefulset manifest specifies that there shall be an
The Elasticsearch StatefulSet manifest specifies that there shall be an
[init container][initContainer] executing before Elasticsearch containers
themselves, in order to ensure that the kernel state variable
`vm.max_map_count` is at least 262144, since this is a requirement of
@ -61,7 +61,7 @@ Learn more in the [official Kubernetes documentation][k8sElasticsearchDocs].
Since Fluentd talks to the Elasticsearch service inside the cluster, instances
on masters won't work, because masters have no kube-proxy. Don't mark masters
with a label mentioned in the previous paragraph or add a taint on them to
with the label mentioned in the previous paragraph or add a taint on them to
avoid Fluentd pods scheduling there.
[fluentd]: http://www.fluentd.org/