Generate release notes for v8.3.0 (elastic#87294)

* Generate release notes for v8.3.0

* [DOCS] Add 8.3 migration file to index

* Fixed version number

* Fix formatting of deprecation in 85326

* Use asciidoc format for deprecations

* Extract static content from migration/index

* This was just an enhancement

* Nope, it was an upgrade

* Added migration/index.asciidoc generation support (elastic#87318)

Including extracting static content from migration/index, so the template would be as light as possible.

The reason for this work is because the gradle task `generateReleaseNotes` was not correctly adding new links and imports to the migrations/index and that caused documentation to fail building for 8.3.0.

* [DOCS] Add ml-cpp PRs to release notes

* Added back incorrectly deleted changlog

* Added missing highlight

* Fixed spelling of StackOverflowError

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

docs/changelog/86261.yaml

@@ -0,0 +1,17 @@
+pr: 86261
+summary: Snapshots as simple archives
+area: Search
+type: feature
+issues:
+  - 81210
+highlight:
+  title: Reading indices from older Elasticsearch versions
+  body: |-
+    Elasticsearch has full query and write support for indices created in the previous major
+    version. If you have indices created in Elasticsearch versions 5 or 6, you can now use
+    the archive functionality to import and query these indices as well.
+    The archive functionality provides slower read-only access to older data,
+    for compliance or regulatory reasons, the occasional lookback or investigation,
+    or to rehydrate parts of it. Access to the data is expected to be infrequent,
+    and can therefore happen with limited performance and query capabilities.
+  notable: true

docs/reference/migration/index.asciidoc

@@ -1,9 +1,11 @@
 include::migration_intro.asciidoc[]
 
-* <<migrating-8.1,Migrating to 8.2>>
+* <<migrating-8.3,Migrating to 8.3>>
+* <<migrating-8.2,Migrating to 8.2>>
 * <<migrating-8.1,Migrating to 8.1>>
 * <<migrating-8.0,Migrating to 8.0>>
 
+include::migrate_8_3.asciidoc[]
 include::migrate_8_2.asciidoc[]
 include::migrate_8_1.asciidoc[]
 include::migrate_8_0.asciidoc[]

docs/reference/migration/migrate_8_3.asciidoc

@@ -0,0 +1,62 @@
+[[migrating-8.3]]
+== Migrating to 8.3
+++++
+<titleabbrev>8.3</titleabbrev>
+++++
+
+This section discusses the changes that you need to be aware of when migrating
+your application to {es} 8.3.
+
+See also <<release-highlights>> and <<es-release-notes>>.
+
+coming::[8.3.0-SNAPSHOT]
+
+
+[discrete]
+[[breaking-changes-8.3]]
+=== Breaking changes
+
+There are no breaking changes in {es} 8.3.
+
+
+[discrete]
+[[deprecated-8.3]]
+=== Deprecations
+
+The following functionality has been deprecated in {es} 8.3
+and will be removed in a future version.
+While this won't have an immediate impact on your applications,
+we strongly encourage you take the described steps to update your code
+after upgrading to 8.3.
+
+To find out if you are using any deprecated functionality,
+enable <<deprecation-logging, deprecation logging>>.
+
+
+[discrete]
+[[deprecations_83_cluster_and_node_setting]]
+==== Cluster and node setting deprecations
+
+[[configuring_bind_dn_in_an_ldap_or_active_directory_ad_realm_without_corresponding_bind_password_deprecated]]
+.Configuring a bind DN in an LDAP or Active Directory (AD) realm without a corresponding bind password is deprecated
+[%collapsible]
+====
+*Details* +
+For LDAP or AD authentication realms, setting a bind DN (via the
+`xpack.security.authc.realms.ldap.*.bind_dn` realm setting) without a
+bind password is a misconfiguration that may prevent successful
+authentication to the node. In the next major release, nodes will fail
+to start if a bind DN is specified without a password.
+
+*Impact* +
+If you have a bind DN configured for an LDAP or AD authentication
+realm, set a bind password for {ref}/ldap-realm.html#ldap-realm-configuration[LDAP]
+or {ref}/active-directory-realm.html#ad-realm-configuration[Active Directory].
+Configuring a bind DN without a password generates a warning in the
+deprecation logs.
+
+*Note:* This deprecation only applies if your current LDAP or AD
+configuration specifies a bind DN without a password. This scenario is
+unlikely, but might impact a small subset of users.
+====
+

docs/reference/release-notes.asciidoc

@@ -6,6 +6,7 @@
 
 This section summarizes the changes in each release.
 
+* <<release-notes-8.3.0>>
 * <<release-notes-8.2.3>>
 * <<release-notes-8.2.2>>
 * <<release-notes-8.2.1>>
@@ -24,6 +25,7 @@ This section summarizes the changes in each release.
 
 --
 
+include::release-notes/8.3.0.asciidoc[]
 include::release-notes/8.2.3.asciidoc[]
 include::release-notes/8.2.2.asciidoc[]
 include::release-notes/8.2.1.asciidoc[]