EASE upgrade instructions (#2534)

Fixes
[elastic/security-docs-internal/203](elastic/docs-content-internal#203)
by adding information about upgrading an EASE deployment to Security
Essentials or Security Complete.

---------

Co-authored-by: Nastasha Solomon <[email protected]>

Author: benironside

solutions/images/security-ease-cloud-console-edit-project-features.png

@@ -0,0 +1,46 @@
+---
+navigation_title: Upgrade from EASE to Elastic Security
+applies_to:
+  serverless:
+    security: preview
+---
+
+# Upgrade from Elastic AI SOC Engine to {{elastic-sec}} to access additional features
+
+This page describes how to upgrade an {{sec-serverless}} project from the Elastic AI SOC Engine (EASE) feature tier to the Security Analytics Essentials or Security Analytics Complete feature tiers.
+
+## Why upgrade?
+EASE provides a small subset of the features available on other {{sec-serverless}} feature tiers. It's designed to add a layer of AI features onto your existing SOC software stack. In contrast, {{elastic-sec}} provides a full set of SOC capabilities including many additional ways to ingest data, prebuilt and customizable detection rules, response actions, integrated threat intelligence, runtime protection, data visualization, and more. 
+
+For a full breakdown of the features available in the Security Analytics Essentials and Security Analytics Complete feature tiers, refer to [Elastic Security Serverless pricing](https://www.elastic.co/pricing/serverless-security).
+
+:::{important}
+The AI features present in EASE are not available on the Essentials tier. 
+:::
+
+
+## How to upgrade from EASE to other feature tiers
+
+1. Log in to the [{{ecloud}} console](https://console.qa.cld.elstc.co/).
+2. Find the project you wish to upgrade on the list of serverless projects, and click **Manage**. 
+
+   :::{image} /solutions/images/security-ease-cloud-console-manage-project.png
+   :alt: The cloud console showing an EASE project with the MANAGE button highlighted
+   :width: 550px
+   :::
+
+3. On the project management page, next to **Project features**, click **Edit**.
+
+   :::{image} /solutions/images/security-ease-cloud-console-edit-project-features.png
+   :alt: The manage project page for an EASE project with the EDIT button highlighted
+   :width: 550px
+   :::
+
+4. Select either the **Security Analytics Essentials** or **Security Analytics Complete** options, and select any desired add-on options. Click **Save**. 
+
+You can return to this page at any point to switch between Essentials and Complete and change your add-on selections.
+However, once you upgrade from EASE to another product tier, you cannot revert or downgrade the project back to EASE. You can always create another new project of any tier.
+
+## What to do after upgrading an EASE project
+
+When you upgrade an EASE project, you gain access to all the {{elastic-sec}} capabilities included in your selected [feature tier](https://www.elastic.co/pricing/serverless-security). To learn more about what {{elastic-sec}} can do and how to use it, refer to [Get started with {{elastic-sec}}](/solutions/security/get-started.md).

solutions/images/security-ease-cloud-console-manage-project.png

@@ -503,6 +503,7 @@ toc:
             children: 
               - file: security/ai/ease/ease-alerts.md
               - file: security/ai/ease/ease-value-report.md
+              - file: security/ai/ease/ease-upgrade.md
           - file: security/ai/ai-assistant.md
             children:
               - file: security/ai/ai-assistant-knowledge-base.md