[DevOps] adding readme for how to deploy elasticstack using helm charts

docs/operations/helm/README.md

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+# Helm
+
+The directory holds the values.yaml for deploying various pre-defined helm charts can be found in `k8s/helm/` 
+
+First off lets assume that helm has already been deployed. 
+
+To install a helm chart it's quite simple:
+
+```
+helm install --name deployment_name --namespace somenamespace chart/name
+```
+
+If we want to specify some overrides to that charge we can specify those as cli arguments, 
+or "more better" we can specify those in values.yaml file. 
+
+```
+helm install -f path/to/values.yaml --name deployment_name --namespace somenamespace chart/name
+```
+
+## Elasticsearch
+
+First off lets deploy Elasticsearch using the 
+[official helm chart](https://github.com/elastic/helm-charts/tree/master/elasticsearch). 
+
+If you haven't added the elastic helm repo you should do that first:
+
+```
+helm repo add elastic https://helm.elastic.co
+```
+
+If you want to practice installing Elasticsearch you can specify a new namespace and delete it when you're done. 
+
+Next let's assume we want to deploy elasticsearch to a testing namespace. Lets call it `test-es`
+
+```
+$ helm install --name elasticsearch --namespace test-es elastic/elasticsearch
+```
+
+Now you can monitor the pods to see if elasticearch is up and ready. 
+
+Now lets say we want to make some changes to the options for deploying elasticsearch. 
+You can create a file in `values` called `Elasticsearch.yaml`. And to deploy these changes
+we just need to run the command: 
+
+```
+$ helm upgrade -f values/elasticsearch.yaml elasticsearch elastic/elasticsearch --namespace test-es
+```
+
+The upgrade process will 1 by 1 take add a new elasticsearch node in to the cluster, wait till the cluster is green
+then remove a node from the cluster, wait till green and so on. 
+
+The upgrade of elasticsearch can be done with 0 downtime using this rolling upgrade procedure. 
+
+This processss can also be used to upgrade elasticsearch to newer versions in the future. 
+
+## Kibana
+
+Deploying kibana is just as simple as deploying elasticsearch. 
+
+Skipping the initial install step like we did with Elasticsearch, lets assume that we already have the values file
+for kibana we wanna use. 
+
+So deploying kibana using a custom values file can be done using: 
+
+```
+helm upgrade -i -f values/kibana.yaml --name kibana --namespace test-es elastic/kibana
+```
+
+We'll note here that this command is slightly different. In this case we are running `upgrade` with the `-i` flag. 
+This means upgrade if a release exists already, if not install it. This command is more idempotent than the first
+command we saw in the [Elasticsearch](./README.md#elasticsearch) section.
+
+### Ingress
+
+Please note that by default the Ingress for Kibana is disabled. 
+If you'd like to enable the ingress for Kibana you must do so explicitly. 
+
+The default configuration for kibana can be found [here](https://github.com/elastic/helm-charts/blob/master/kibana/values.yaml#L105-L116)
+
+In the `values/kibana.yaml` file you must override the Ingress settings to enable an ingress for Kibana. 
+
+### Port Forwarding
+
+In the meantime after kibana has been deployed you can use kubectl's port forwarding to be able to access kibana
+instance using localhost. 
+
+```
+$ kubectl port-forward deployment/kibana-kibana 5601 -n test-es
+```
+
+Now you can access kibana through `http://localhost:5601`
+
+
+## APM Server
+
+Deploying the APM server using a custom values.yaml file would look like: 
+
+```
+helm upgrade -i -f values/apm-server.yaml --name apm-server --namespace test-es elastic/apm-server
+```
+
+Like Kibana the APM server is configured without an ingress. This should not be exposed publicly, except in the case
+where you want to collect APM data from an application that's running outside of the k8s cluster. 
+Even in that event, I would suggest, deploying that app to k8s instead. 
+
+## Beats
+
+Deploying the metricbeats and filebeats using a custom values.yaml file would look like: 
+
+```
+helm upgrade -i -f values/filebeat.yaml --name filebeat --namespace test-es elastic/filebeat
+helm upgrade -i -f values/metricbeat.yaml --name metricbeat --namespace test-es elastic/metricbeat
+```
+
+Metricbeat and filebeat are both configured by default to start pulling metrics/logs from the k8s cluster and ship to the local Elasticsearch instance. 
+

k8s/helm/values/elasticsearch.yaml

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+---
+
+clusterName: "chime-bus"