Add more details about the breaking change in 0.11.18 (#1364)

Author: tobio

CHANGELOG.md

@@ -1,8 +1,8 @@
 ## [Unreleased]
 
 - Fix provider crash with `elasticstack_kibana_action_connector` when `config` or `secrets` was unset in 0.11.17 ([#1355](https://github.com/elastic/terraform-provider-elasticstack/pull/1355))
-- Fixes provider crash with `elasticstack_kibana_slo` when using `kql_custom_indicator` with no `filter` set.
-- Updates for Security Detection Rules
+- Fixes provider crash with `elasticstack_kibana_slo` when using `kql_custom_indicator` with no `filter` set. ([#1354](https://github.com/elastic/terraform-provider-elasticstack/pull/1354))
+- Updates for Security Detection Rules ([#1361](https://github.com/elastic/terraform-provider-elasticstack/pull/1361)
   - Add support for `threat` property
   - Gracefully support `query` property not being set
   - Add esql specific validations to reject unsupported fields `index` and `filters`
@@ -13,6 +13,34 @@
 
 ## [0.11.18] - 2025-10-10
 
+### Breaking changes
+
+The `ssl` field on the `elasticstack_fleet_output` resource has been changes from a block to an attribute. This change ensures ongoing consistency within the resource schema for this resource, and aligns with Terraform best practices. 
+
+Existing `elasticstack_fleet_output` resources defining `ssl` will have to update the declaration to an attribute style. For example: 
+
+```hcl
+resource "elasticstack_fleet_output" "output" {
+  ...
+  ssl {
+    ...
+  }
+}
+```
+
+becomes 
+
+```hcl
+resource "elasticstack_fleet_output" "output" {
+  ...
+  ssl = {  # Note the equals sign here. 
+    ...
+  }
+}
+```
+
+### Changes
+
 - Create `elasticstack_kibana_security_detection_rule` resource. ([#1290](https://github.com/elastic/terraform-provider-elasticstack/pull/1290))
 - Add `elasticstack_kibana_export_saved_objects` data source ([#1293](https://github.com/elastic/terraform-provider-elasticstack/pull/1293))
 - Create `elasticstack_kibana_maintenance_window` resource. ([#1224](https://github.com/elastic/terraform-provider-elasticstack/pull/1224))