Add elasticsearch docs to docs.kansiter.io (#4192)

* Add elasticsearch docs to docs.kansiter.io

* address review comment

docs/helm.rst

@@ -39,3 +39,4 @@ The following application-specific instructions are available:
    helm_instructions/mysql_instructions.rst
    helm_instructions/pgsql_instructions.rst
    helm_instructions/mongodb_instructions.rst
+   helm_instructions/elasticsearch_instructions.rst

docs/helm_instructions/elasticsearch_instructions.rst

@@ -0,0 +1,59 @@
+Kanister-Enabled Elasticsearch
+------------------------------
+
+This section describes the steps for a basic installation of an instance of
+Elasticsearch (a stateful set application running master, client and data
+nodes with persistent volumes attached to master and data nodes) along with
+a Kanister Blueprint and a Profile via a Kanister-enabled Helm chart.
+
+.. code-block:: console
+
+   $ helm repo add kanister https://charts.kanister.io/
+
+
+Then install the sample Elasticsearch application in its own namespace.
+
+.. For some reason using 'console' or 'bash' highlights the snippet weirdly
+
+.. only:: kanister
+
+  .. code-block:: rst
+
+     # Install Kanister-enabled Elasticsearch
+     $ helm install kanister/kanister-elasticsearch -n elasticsearch \
+          --namespace es-test \
+          --set profile.create='true' \
+          --set profile.profileName='es-test-profile' \
+          --set profile.s3.endpoint='https://my-custom-s3-provider:9000' \
+          --set profile.s3.accessKey='AKIAIOSFODNN7EXAMPLE' \
+          --set profile.s3.secretKey='wJalrXUtnFEMI%K7MDENG%bPxRfiCYEXAMPLEKEY' \
+          --set profile.s3.bucket='kanister-bucket'
+          --set kanister.controller_namespace="kanister"
+
+.. only:: defaultns
+
+  .. code-block:: rst
+
+     # Install Kanister-enabled Elasticsearch
+     $ helm install kanister/kanister-elasticsearch -n elasticsearch --namespace es-test
+
+
+The settings in the command above represent the minimum recommended set for
+your installation.
+
+.. only:: kanister
+
+  .. include:: ./create_profile.rst
+
+  If not creating a Profile CR, it is possible to use an even simpler command.
+
+  .. code-block:: rst
+
+     # Install Kanister-enabled Elasticsearch
+     $ helm install kanister/kanister-elasticsearch -n elasticsearch --namespace es-test
+
+.. note:: The above command will attempt to use dynamic storage provisioning
+   based on the the default storage class for your cluster. You will to need to
+   `designate a default storage class <https://kubernetes.io/docs/tasks/administer-cluster/change-default-storage-class/#changing-the-default-storageclass>`_
+   or, use a specific storage class by providing a value with the
+   ``--set master.persistence.storageClass`` and ``--set data.persistence.storageClass`` option.

docs/spelling_wordlist.txt

@@ -28,3 +28,4 @@ Dockerfile
 PersistentVolumeClaim
 actionset
 objectstore
+Elasticsearch