Refer to serverless project feature tiers as such and not as subscription nor features (#3249)

This PR streamlines the way we refer to serverless feature tiers in the
docs:
- Feature tier names should be written in full form
- A feature tier isn't a subscription. This term is reserved on Elastic
Cloud, it refers to the Elastic Cloud subscription that determines ECH
deployment features and the support level for both ECH deployments and
serverless projects. Any non-trial user on Elastic Cloud needs an
Elastic Cloud subscription regardless of their usage of ECH or
serverless.
- we should consistently use "feature tier" when we need this term. Not
just feature, not just tier (though just tier sounds more acceptable)
- It's fine to say "Security Analytics Essentials project" too. We don't
have to overuse "feature tier"

Closes: #2768

---------

Co-authored-by: shainaraskas <[email protected]>

Author: florent-leborgne

deploy-manage/cloud-organization/billing/elastic-observability-billing-dimensions.md

@@ -26,8 +26,8 @@ Refer to [Serverless billing dimensions](serverless-project-billing-dimensions.m
 
 ## Synthetics [synthetics-billing]
 
-[Synthetic monitoring](/solutions/observability/synthetics/index.md) is an optional add-on to Observability Serverless projects that allows you to periodically check the status of your services and applications as a part of your "Complete" tier subscription. In addition to the core ingest and retention dimensions, there is a charge to execute synthetic monitors on our testing infrastructure. Browser (journey) based tests are charged per-test-run, and ping (lightweight) tests have an all-you-can-use model per location used.
+[Synthetic monitoring](/solutions/observability/synthetics/index.md) is an optional add-on to Observability Serverless projects that allows you to periodically check the status of your services and applications as a part of the "Observability Complete" feature tier. In addition to the core ingest and retention dimensions, there is a charge to execute synthetic monitors on our testing infrastructure. Browser (journey) based tests are charged per-test-run, and ping (lightweight) tests have an all-you-can-use model per location used.
 
 ## Elastic Managed LLM
 
-The default [Elastic Managed LLM](kibana://reference/connectors-kibana/elastic-managed-llm.md) enables you to leverage AI-powered search as a service without deploying a model in your serverless project. It's configured by default to use with the Security AI Assistant, Attack Discovery, and other applicable AI features as a part of your "Complete" tier subscription. Using the default LLM will use tokens and incur related token-based add-on billing for your serverless project.
+The default [Elastic Managed LLM](kibana://reference/connectors-kibana/elastic-managed-llm.md) enables you to leverage AI-powered search as a service without deploying a model in your serverless project. It's configured by default to use with the Security AI Assistant, Attack Discovery, and other applicable AI features as a part of the "Observability Complete" feature tier. Using the default LLM will use tokens and incur related token-based add-on billing for your serverless project.

deploy-manage/cloud-organization/billing/security-billing-dimensions.md

@@ -73,4 +73,4 @@ For more details about {{elastic-sec}} serverless project rates and billable ass
 
 ## Elastic Managed LLM
 
-The default [Elastic Managed LLM](kibana://reference/connectors-kibana/elastic-managed-llm.md) enables you to leverage AI-powered search as a service without deploying a model in your serverless project. It's configured by default to use with the Security AI Assistant, Attack Discovery, and other applicable AI features as a part of your "Complete" tier subscription. Using the default LLM will use tokens and incur related token-based add-on billing for your serverless project.
+The default [Elastic Managed LLM](kibana://reference/connectors-kibana/elastic-managed-llm.md) enables you to leverage AI-powered search as a service without deploying a model in your serverless project. It's configured by default to use with the Security AI Assistant, Attack Discovery, and other applicable AI features as a part of the "Security Analytics Complete" feature tier. Using the default LLM will use tokens and incur related token-based add-on billing for your serverless project.

deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md

@@ -105,7 +105,7 @@ This table compares Elasticsearch capabilities between {{ech}} deployments and S
 
 ### Observability
 
-This table compares Observability capabilities between {{ech}} deployments and Observability Complete Serverless projects. For more information on Observability Logs Essentials Serverless projects, refer to [Observability subscription tiers](../../../solutions/observability/observability-serverless-feature-tiers.md).
+This table compares Observability capabilities between {{ech}} deployments and Observability Complete Serverless projects. For more information on Observability Logs Essentials Serverless projects, refer to [Observability feature tiers](../../../solutions/observability/observability-serverless-feature-tiers.md).
 
 | **Feature** | {{ech}} | Serverless Observability Complete projects | Serverless notes |
 |---------|----------------------|-----------------------------------|------------------|

solutions/observability/observability-serverless-feature-tiers.md

@@ -15,7 +15,7 @@ products:
 
 Refer to the [feature comparison table](#obs-subscription-features) for a more detailed comparison between the tiers.
 
-## Subscription tier pricing [obs-subscription-pricing]
+## Feature tier pricing [obs-subscription-pricing]
 
 For pricing information, refer to [Elastic Observability Serverless pricing](https://www.elastic.co/pricing/serverless-observability).
 
@@ -53,7 +53,7 @@ From the main navigation menu, select **Add data**. Select what you want to moni
 Upgrading from Observability Logs Essentials to Observability Complete is permanent and is not reversible.
 :::
 
-To access the additional features available in Observability Complete, upgrade your Observability Logs Essentials subscription by completing the following steps:
+To access the additional features available in Observability Complete, upgrade your Observability project feature tier by completing the following steps:
 
 1. From the [{{ecloud}} Console](https://cloud.elastic.co), select **Manage** next to the Observability Logs Essentials serverless project you want to upgrade.
 1. Next to **Project features**, select **Edit**.

solutions/security/advanced-entity-analytics/behavioral-detection-use-cases.md

@@ -25,7 +25,7 @@ Behavioral detection integrations provide a convenient way to enable behavioral
 
 ::::{admonition} Requirements
 * In {{stack}}, behavioral detection integrations require a [Platinum subscription](https://www.elastic.co/pricing) or higher.
-* In serverless, behavioral detection integrations require the Security Analytics Complete [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* In serverless, behavioral detection integrations require the Security Analytics Complete [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 * To learn more about the requirements for using {{ml}} jobs, refer to [Machine learning job and rule requirements](/solutions/security/advanced-entity-analytics/machine-learning-job-rule-requirements.md).
 
 ::::

solutions/security/advanced-entity-analytics/entity-risk-scoring-requirements.md

@@ -17,7 +17,7 @@ This page covers the requirements and guidelines for using the entity risk scori
 
 To use these features in {{stack}}, your role must have certain cluster, index, and {{kib}} privileges. In {{serverless-short}}, you need the appropriate user roles or a custom role with the right privileges.
 
-In {{stack}}, these features require a [Platinum subscription](https://www.elastic.co/pricing) or higher. In {{serverless-short}}, they require the Security Analytics Complete [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+In {{stack}}, these features require a [Platinum subscription](https://www.elastic.co/pricing) or higher. In {{serverless-short}}, they require the Security Analytics Complete [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 
 
 ## Entity risk scoring [_entity_risk_scoring]

solutions/security/advanced-entity-analytics/overview.md

@@ -13,7 +13,7 @@ The **Entity analytics** page provides a centralized view of emerging insider th
 To access the page, find **Entity analytics** → **Overview** in the navigation menu or use the [global search field](/explore-analyze/find-and-organize/find-apps-and-objects.md).
 
 :::{admonition} Requirements
-* This feature requires the appropriate [subscription](https://www.elastic.co/pricing) in {{stack}} or [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md) in {{serverless-short}}.
+* This feature requires the appropriate [subscription](https://www.elastic.co/pricing) in {{stack}} or [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md) in {{serverless-short}}.
 
 * To get access to this page, turn on the `securitySolution:enablePrivilegedUserMonitoring` [advanced setting](/solutions/security/get-started/configure-advanced-settings.md#access-privileged-user-monitoring).
 :::

solutions/security/configure-elastic-defend/configure-an-integration-policy-for-elastic-defend.md

@@ -67,7 +67,7 @@ By default, malware protection is enabled on Windows, macOS, and Linux hosts. To
 
 ::::{admonition} Requirements
 :class: note
-In {{serverless-short}}, malware protection requires the Endpoint Protection Essentials [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+In {{serverless-short}}, malware protection requires the Endpoint Protection Essentials [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 ::::
 
 Malware protection levels are:
@@ -83,7 +83,7 @@ These additional options are available for malware protection:
 Select **Notify user** to send a push notification in the host operating system when activity is detected or prevented. Notifications are enabled by default for the **Prevent** option.
 
 ::::{tip}
-If you have the appropriate license or project feature, you can customize these notifications using the `Elastic Security {action} {filename}` syntax.
+If you have the appropriate license or project feature tier, you can customize these notifications using the `Elastic Security {action} {filename}` syntax.
 ::::
 
 
@@ -125,7 +125,7 @@ Behavioral ransomware prevention detects and stops ransomware attacks on Windows
 ::::{admonition} Requirements
 :class: note
 * In {{stack}}, ransomware protection is enabled by default if you have a [Platinum or Enterprise license](https://www.elastic.co/pricing). If you upgrade to a Platinum or Enterprise license from Basic or Gold, ransomware protection will be disabled by default.
-* In {{serverless-short}}, ransomware protection requires the Endpoint Protection Essentials [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* In {{serverless-short}}, ransomware protection requires the Endpoint Protection Essentials [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 ::::
 
 
@@ -139,7 +139,7 @@ When ransomware protection is enabled, canary files placed in targeted locations
 Select **Notify user** to send a push notification in the host operating system when activity is detected or prevented. Notifications are enabled by default for the **Prevent** option.
 
 ::::{tip}
-If you have the appropriate license or project feature, you can customize these notifications using the `Elastic Security {action} {filename}` syntax.
+If you have the appropriate license or project feature tier, you can customize these notifications using the `Elastic Security {action} {filename}` syntax.
 ::::
 
 
@@ -156,7 +156,7 @@ Memory threat protection detects and stops in-memory threats, such as shellcode
 :::{admonition} Requirements
 :class: note
 * In {{stack}}, memory threat protection is enabled by default if you have a [Platinum or Enterprise license](https://www.elastic.co/pricing). If you upgrade to a Platinum or Enterprise license from Basic or Gold, memory threat protection will be disabled by default.
-* In {{serverless-short}}, memory threat protection requires the Endpoint Protection Essentials [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* In {{serverless-short}}, memory threat protection requires the Endpoint Protection Essentials [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 ::::
 
 
@@ -168,7 +168,7 @@ Memory threat protection levels are:
 Select **Notify user** to send a push notification in the host operating system when activity is detected or prevented. Notifications are enabled by default for the **Prevent** option.
 
 ::::{tip}
-If you have the appropriate license or project feature, you can customize these notifications using the `Elastic Security {action} {rule}` syntax.
+If you have the appropriate license or project feature tier, you can customize these notifications using the `Elastic Security {action} {rule}` syntax.
 ::::
 
 
@@ -185,7 +185,7 @@ Malicious behavior protection detects and stops threats by monitoring the behavi
 ::::{admonition} Requirements
 :class: note
 * In {{stack}}, malicious behavior protection is enabled by default if you have a [Platinum or Enterprise license](https://www.elastic.co/pricing). If you upgrade to a Platinum or Enterprise license from Basic or Gold, malicious behavior protection will be disabled by default.
-* In {{serverless-short}}, malicious behavior protection requires the Endpoint Protection Essentials [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* In {{serverless-short}}, malicious behavior protection requires the Endpoint Protection Essentials [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 ::::
 
 
@@ -204,7 +204,7 @@ In {{stack}}, reputation service requires an active [Platinum or Enterprise subs
 Select **Notify user** to send a push notification in the host operating system when activity is detected or prevented. Notifications are enabled by default for the **Prevent** option.
 
 ::::{tip}
-If you have the appropriate license or project feature, you can customize these notifications using the `Elastic Security {action} {rule}` syntax.
+If you have the appropriate license or project feature tier, you can customize these notifications using the `Elastic Security {action} {rule}` syntax.
 ::::
 
 
@@ -220,7 +220,7 @@ This section helps you reduce vulnerabilities that attackers can target on Windo
 
 ::::{admonition} Requirements
 :class: note
-In {{serverless-short}}, attack surface reduction requires the Endpoint Protection Essentials [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+In {{serverless-short}}, attack surface reduction requires the Endpoint Protection Essentials [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 ::::
 
 **Credential hardening**: Prevents attackers from stealing credentials stored in Windows system process memory. Turn on the toggle to remove any overly permissive access rights that aren’t required for standard interaction with the Local Security Authority Subsystem Service (LSASS). This feature enforces the principle of least privilege without interfering with benign system activity that is related to LSASS.

solutions/security/configure-elastic-defend/configure-self-healing-rollback-for-windows-endpoints.md

@@ -21,7 +21,7 @@ This can help contain the impact of malicious activity, as {{elastic-defend}} no
 :class: note
 * Self-healing rollback is only supported for Windows endpoints.
 * In {{stack}}, this feature requires a [Platinum or Enterprise subscription](https://www.elastic.co/pricing).
-* In {{serverless-short}}, this feature requires the Endpoint Protection Complete [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* In {{serverless-short}}, this feature requires the Endpoint Protection Complete [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 ::::
 
 

solutions/security/configure-elastic-defend/prevent-elastic-agent-uninstallation.md

@@ -20,7 +20,7 @@ When enabled, {{agent}} and {{elastic-endpoint}} can only be uninstalled on the
 
 ::::{admonition} Requirements
 * In {{stack}}, agent tamper protection requires a [Platinum or higher subscription](https://www.elastic.co/pricing).
-* In {{serverless-short}}, agent tamper protection requires the Endpoint Protection Complete [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* In {{serverless-short}}, agent tamper protection requires the Endpoint Protection Complete [project feature tier](/deploy-manage/deploy/elastic-cloud/project-settings.md).
 * Hosts must be enrolled in the {{elastic-defend}} integration.
 * {{agent}}s must be version 8.11.0 or later.
 * This feature is supported for all operating systems.