Update docs for v8.10.4 release (elastic#100772) (elastic#100818)

(cherry picked from commit 78ac64f)
Signed-off-by: Andrei Dan <andrei.dan@elastic.co>

Author: andreidan

docs/reference/release-notes.asciidoc

@@ -7,6 +7,7 @@
 This section summarizes the changes in each release.
 
 * <<release-notes-8.11.0>>
+* <<release-notes-8.10.4>>
 * <<release-notes-8.10.3>>
 * <<release-notes-8.10.2>>
 * <<release-notes-8.10.1>>
@@ -53,6 +54,7 @@ This section summarizes the changes in each release.
 --
 
 include::release-notes/8.11.0.asciidoc[]
+include::release-notes/8.10.4.asciidoc[]
 include::release-notes/8.10.3.asciidoc[]
 include::release-notes/8.10.2.asciidoc[]
 include::release-notes/8.10.1.asciidoc[]

docs/reference/release-notes/8.10.4.asciidoc

@@ -0,0 +1,21 @@
+[[release-notes-8.10.4]]
+== {es} version 8.10.4
+
+coming[8.10.4]
+
+Also see <<breaking-changes-8.10,Breaking changes in 8.10>>.
+
+[[bug-8.10.4]]
+[float]
+=== Bug fixes
+
+Search::
+* Search of remote clusters with no shards results in successful status {es-pull}100354[#100354]
+
+Snapshot/Restore::
+* Improve `RepositoryData` BwC {es-pull}100401[#100401]
+
+Transform::
+* Shutdown the task immediately when `force` == `true` {es-pull}100203[#100203]
+
+