[Docs] Kibana 9.4.0 release notes

docs/release-notes/breaking-changes.md

@@ -36,6 +36,35 @@
 % 4. You can then call the link from any Kibana code. For example: `href: docLinks.links.upgradeAssistant.id`
 % Check https://docs.elastic.dev/docs/kibana-doc-links (internal) for more details about the Doc links service.
 
+## 9.4.0 [kibana-9.4.0-breaking-changes]
+
+$$$kibana-255122-9.4.0$$$
+::::{dropdown} The `_source` field mode is now saved to the template index settings
+**Details**<br> The index and component template forms in **Index Management** previously saved the `_source` field mode (`stored` and `synthetic`) in the `mappings._source.mode` setting. This path is deprecated and has no effect in {{es}}. The form now uses the correct `settings.index.mapping.source.mode` setting. Other `_source` options (`enabled`, `includes`, and `excludes`) remain in mappings.
+
+**Impact**<br> When you edit a template in the UI, any existing `mappings._source.mode` setting is automatically moved to the index settings and removed from mappings.
+
+**Action**<br> The migration happens automatically when you edit a template in the **Index Management** UI. If you manage templates outside the UI (via API or configuration files), update them to use `settings.index.mapping.source.mode` instead of `mappings._source.mode`.
+
+View [#255122]({{kib-pull}}255122).
+::::
+
+
+$$$kibana-249855$$$
+::::{dropdown} {{esql}} tool parameter types simplified in Agent Builder API
+**Details**<br> The Agent Builder {{esql}} tool API now uses simplified parameter types aligned with {{esql}}'s actual capabilities instead of Elasticsearch field types. The supported `configuration.params[*].type` values are now: `string`, `integer`, `float`, `boolean`, and `date`. Previously accepted types (`text`, `keyword`, `long`, `double`, `object`, `nested`) are no longer valid for new API requests. Additionally, `defaultValue` is now restricted to `string | number | boolean` and requires `optional: true` to be set.
+
+**Impact**<br> API calls to `POST /api/agent_builder/tools` or `PUT /api/agent_builder/tools/{id}` that use legacy parameter types will be rejected with a 400 error. Existing tools stored with legacy types are automatically migrated on read: `text`/`keyword`/`object`/`nested` become `string`, `long` becomes `integer`, and `double` becomes `float`. Legacy `object`/`nested` default values are JSON-stringified.
+
+**Action**<br> Update any integrations that create or update {{esql}} tools via the API to use the new type values:
+- Use `string` instead of `text`, `keyword`, `object`, or `nested`
+- Use `integer` instead of `long`
+- Use `float` instead of `double`
+- Ensure `defaultValue` is only provided when `optional: true`
+
+View [#249855]({{kib-pull}}249855).
+::::
+
 ## 9.3.2 [kibana-9.3.2-breaking-changes]
 $$$kibana-255122$$$
 ::::{dropdown} The `_source` field mode is now saved to the template index settings
@@ -113,7 +142,7 @@
 
 **Impact**<br> Deprecated endpoints will fail with a 404 status code starting from version 9.0.0.
 
 **Action**<br> Remove references to `GET /api/alerts/{{id}}/_instance_summary` endpoint. Remove references to `GET /api/alerts/{{id}}/state` endpoint. Replace references to endpoints listed as deprecated by it’s replacement. See `Details` section. The updated APIs can be found in [https://www.elastic.co/docs/api/doc/kibana/group/endpoint-alerting](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-alerting).
 ::::
 
 $$$kibana-198435$$$

docs/release-notes/deprecations.md

@@ -34,6 +34,30 @@
 % 4. You can then call the link from any Kibana code. For example: `href: docLinks.links.upgradeAssistant.id`
 % Check https://docs.elastic.dev/docs/kibana-doc-links (internal) for more details about the Doc links service.
 
+## 9.4.0 [kibana-9.4.0-deprecations]
+
+$$$kibana-263694$$$
+::::{dropdown} Direct AI connector step types deprecated in favor of `ai.prompt`
+**Details**<br> All direct AI connector workflow step types (`inference.*`, `bedrock.*`, `gen-ai.*`, `gemini.*`) are now deprecated. These steps are hidden from autocomplete suggestions and the **Add Action** menu in the workflow editor. Existing workflows using these step types continue to work but display a deprecation warning.
+
+**Impact**<br> New workflows cannot easily discover or add direct AI connector steps. Existing workflows remain functional but show deprecation warnings in the editor.
+
+**Action**<br> Migrate workflows to use the purpose-built `ai.prompt` step instead of direct AI connector steps. The `ai.prompt` step provides a consistent interface for AI operations regardless of the underlying connector type.
+
+View [#263694]({{kib-pull}}263694).
+::::
+
+$$$kibana-242972$$$
+::::{dropdown} Deprecated `state:storeInSessionStorage` advanced setting
+**Details**<br> The artificial URL length limit has been removed from Kibana, and the `state:storeInSessionStorage` advanced setting is now deprecated. This setting was originally provided as a workaround for URL length limits in older browsers. Modern browsers no longer have these limits, and using this setting can prevent copying and pasting URLs directly between tabs.
+
+**Impact**<br> The `state:storeInSessionStorage` setting will be removed in a future version. Enabling this setting may cause issues with URL sharing in Discover and Dashboards.
+
+**Action**<br> Disable the `state:storeInSessionStorage` setting if it is currently enabled. Go to **Stack Management** > **Advanced Settings** and set `state:storeInSessionStorage` to `false`.
+
+View [#242972]({{kib-pull}}242972).
+::::
+
 ## 9.3.0 [kibana-9.3.0-deprecations]
 
 There are no deprecations in this version.