[DOCS] Adds changelog to Elasticsearch Reference (#30310)

Author: lcawl

docs/CHANGELOG.asciidoc

@@ -1,50 +1,49 @@
+[[es-release-notes]]
+= {es} Release Notes
+
+[partintro]
+--
 // Use these for links to issue and pulls. Note issues and pulls redirect one to
 // each other on Github, so don't worry too much on using the right prefix.
 // :issue: https://github.com/elastic/elasticsearch/issues/
 // :pull: https://github.com/elastic/elasticsearch/pull/
 
-= Elasticsearch Release Notes
-
-== Elasticsearch 7.0.0
-
-=== Breaking Changes
-
-<<write-thread-pool-fallback, Removed `thread_pool.bulk.*` settings and
-`es.thread_pool.write.use_bulk_as_display_name` system property>> ({pull}29609[#29609])
-
-<<remove-suggest-metric, Removed `suggest` metric on stats APIs>> ({pull}29635[#29635])
+This section summarizes the changes in each release.
 
-=== Breaking Java Changes
+* <<release-notes-6.4.0>>
 
-=== Deprecations
 
-=== New Features
+--
 
-=== Enhancements
-
-=== Bug Fixes
+[[release-notes-6.4.0]]
+== {es} 6.4.0
 
-Fail snapshot operations early when creating or deleting a snapshot on a repository that has been
-written to by an older Elasticsearch after writing to it with a newer Elasticsearch version. ({pull}30140[#30140])
+//[float]
+//[[breaking-6.4.0]]
+//=== Breaking Changes
 
-=== Regressions
+//[float]
+//=== Breaking Java Changes
 
-=== Known Issues
+//[float]
+//=== Deprecations
 
-== Elasticsearch version 6.4.0
-
-=== New Features
+//[float]
+//=== New Features
 
+[float]
 === Enhancements
 
 <<copy-source-settings-on-resize, Allow copying source settings on index resize operations>> ({pull}30255[#30255])
 
+[float]
 === Bug Fixes
 
 Do not ignore request analysis/similarity settings on index resize operations when the source index already contains such settings ({pull}30216[#30216])
 
-=== Regressions
-
-=== Known Issues
+//[float]
+//=== Regressions
 
+//[float]
+//=== Known Issues
 

docs/reference/index-shared4.asciidoc

@@ -5,4 +5,4 @@ include::testing.asciidoc[]
 
 include::glossary.asciidoc[]
 
-include::release-notes.asciidoc[]
+include::{docdir}/../CHANGELOG.asciidoc[]

x-pack/docs/en/release-notes/6.0.0-alpha1.asciidoc

@@ -34,6 +34,5 @@ Watcher::
 
 See also:
 
-* <<release-notes-6.0.0-alpha1,{es} 6.0.0-alpha1 Release Notes>>
 * {kibana-ref}/release-notes-xkb.html[{kib} {xpack} Release Notes]
 * {logstash-ref}/release-notes-xls.html[Logstash {xpack} Release Notes]

x-pack/docs/en/release-notes/6.0.0-alpha2.asciidoc

@@ -39,6 +39,5 @@ Metadata fails, the update is now retried.
 
 See also:
 
-* <<release-notes-6.0.0-alpha2,{es} 6.0.0-alpha2 Release Notes>>
 * {kibana-ref}/release-notes-xkb.html[{kib} {xpack} Release Notes]
 * {logstash-ref}/release-notes-xls.html[Logstash {xpack} Release Notes]

x-pack/docs/en/release-notes/6.0.0-beta1.asciidoc

@@ -29,6 +29,5 @@ to `false` in your `elasticsearch.yml`. See
 
 See also:
 
-* <<release-notes-6.0.0-beta1,{es} 6.0.0-beta1 Release Notes>>
 * {kibana-ref}/release-notes-xkb.html[{kib} {xpack} Release Notes]
 * {logstash-ref}/release-notes-xls.html[Logstash {xpack} Release Notes]

x-pack/docs/en/release-notes/6.0.0-beta2.asciidoc

@@ -79,6 +79,5 @@ Watcher::
 
 See also:
 
-* <<release-notes-6.0.0-beta2,{es} 6.0.0-beta2 Release Notes>>
 * {kibana-ref}/release-notes-xkb.html[{kib} {xpack} Release Notes]
 * {logstash-ref}/release-notes-xls.html[Logstash {xpack} Release Notes]

x-pack/docs/en/release-notes/6.0.0-rc1.asciidoc

@@ -72,6 +72,5 @@ Watcher::
 
 See also:
 
-* <<release-notes-6.0.0-rc1,{es} 6.0.0-rc1 Release Notes>>
 * {kibana-ref}/release-notes-xkb.html[{kib} {xpack} Release Notes]
 * {logstash-ref}/release-notes-xls.html[Logstash {xpack} Release Notes]

x-pack/docs/en/release-notes/6.0.0-rc2.asciidoc

@@ -69,6 +69,5 @@ to require multiple binds when authenticating in user search mode.
 
 See also:
 
-* <<release-notes-6.0.0-rc2,{es} 6.0.0-rc2 Release Notes>>
 * {kibana-ref}/release-notes-xkb.html[{kib} {xpack} Release Notes]
 * {logstash-ref}/release-notes-xls.html[Logstash {xpack} Release Notes]