Add page on OpenSearch keystore in security configuration (#6304) (#6334

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* Add page on OpenSearch keystore in security configuration



* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Capitalize keystore



* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* OpenSearch Keystore to OpenSearch keystore



* Update opensearch-keystore.md

* Update _security/configuration/opensearch-keystore.md




* Update opensearch-keystore.md

* Apply suggestions from code review



* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




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* Address review feedback



* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Update _security/configuration/opensearch-keystore.md




* Address review feedback



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(cherry picked from commit 5093bd2)

Signed-off-by: Craig Perkins <[email protected]>
Signed-off-by: Craig Perkins <[email protected]>
Signed-off-by: Naarcha-AWS <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Naarcha-AWS <[email protected]>
Co-authored-by: Nathan Bower <[email protected]>

_security/configuration/opensearch-keystore.md

@@ -0,0 +1,116 @@
+---
+layout: default
+title: OpenSearch keystore
+parent: Configuration
+nav_order: 50
+---
+
+# OpenSearch keystore
+
+`opensearch-keystore` is a utility script used to manage an OpenSearch keystore. An OpenSearch keystore provides a secure method of storing sensitive information, such as passwords and keys, used in an OpenSearch cluster. The script allows you to securely create, list, add, and remove settings. It is included in the OpenSearch distribution. 
+
+## Usage
+
+In order to use the `opensearch-keystore` script, you must have access to the file system containing the OpenSearch installation and the ability to execute OpenSearch scripts.
+
+To use `opensearch-keystore`, open a terminal and use the following command syntax:
+
+```
+opensearch-keystore [command] [options]
+```
+{% include copy.html %}
+
+## Commands
+
+The `opensearch-keystore` script supports the following the commands: 
+
+- `create`: Initializes a new keystore. If a keystore already exists, this command will overwrite the existing keystore.
+- `list`: Lists all settings in the keystore.
+- `add <setting-name>`: Adds a new setting to the current keystore. When a new setting is added, the script prompts you for the value of that setting. After adding the setting and value, both are securely stored in the keystore.
+- `add-file <file-name>`: Adds a new file to the keystore.
+- `remove <setting-name>`: Removes an existing setting from the keystore.
+- `upgrade <setting-name>`: Upgrades an existing setting in the keystore.
+- `passwd`: Sets a password for the keystore.
+- `has-passwd`: Prints whether the keystore is password protected.
+- `help`: Displays help information about all `opensearch-keystore` commands.
+
+## Options
+
+You can append each command with the following options:
+
+- `-h, --help`: Displays help information about the script and its options.
+- `-s, --silent`: Provides minimal output when the script responds to a command.
+- `-v, --verbose`: Provides a verbose output for debugging purposes.
+
+## Examples
+
+The following examples provide the basic syntax for common `opensearch-keystore` commands:
+
+### Creating a new keystore
+
+**Command**
+
+```bash
+./bin/opensearch-keystore create
+```
+{% include copy.html %}
+
+If a keystore already exists, the script will ask whether you would like to overwrite the existing keystore.
+
+**Response**
+
+The script responds with a confirmation that the keystore was created:
+
+```bash
+Created opensearch keystore in $OPENSEARCH_HOME/config/opensearch.keystore
+```
+
+### Listing settings in the keystore
+
+**Command**
+
+```bash
+./bin/opensearch-keystore list
+```
+{% include copy.html %}
+
+**Response**
+
+The script responds with a list of settings in the keystore:
+
+```bash
+keystore.seed
+plugins.security.ssl.http.pemkey_password_secure
+```
+
+### Adding a new setting
+
+```bash
+./bin/opensearch-keystore add plugins.security.ssl.http.pemkey_password_secure
+```
+{% include copy.html %}
+
+**Response**
+
+After this command, you will be prompted to enter the secret key securely.
+
+### Removing a setting
+
+**Command**
+
+```bash
+./bin/opensearch-keystore remove plugins.security.ssl.http.pemkey_password_secure
+```
+{% include copy.html %}
+
+**Response**
+
+No response exists for this command. To confirm that the setting was deleted, use `opensearch-keystore list`.
+
+## Referring to keystore entries
+
+After a setting has been added to a keystore, you can refer back to that setting in your OpenSearch configuration. To refer back to the setting, add the keystore setting name as a placeholder in the `opensearch.yml` configuration file, as shown in the following example:
+
+```bash
+plugins.security.ssl.http.pemkey_password_secure: ${plugins.security.ssl.http.pemkey_password_secure}
+```