[DOCS] Add 8.18.2 release notes (#2388) (#2389)

(cherry picked from commit e023ac5)

Author: jbaiera

docs/src/reference/asciidoc/appendix/release-notes/8.18.2.adoc

@@ -0,0 +1,5 @@
+[[eshadoop-8.18.2]]
+== Elasticsearch for Apache Hadoop version 8.18.2
+
+ES-Hadoop 8.18.2 is a version compatibility release, tested specifically against
+Elasticsearch 8.18.2.

docs/src/reference/asciidoc/appendix/release.adoc

@@ -9,6 +9,7 @@ This section summarizes the changes in each release.
 [[release-notes-8]]
 ===== 8.x
 
+* <<eshadoop-8.18.2>>
 * <<eshadoop-8.18.1>>
 * <<eshadoop-8.18.0>>
 * <<eshadoop-8.17.6>>
@@ -131,6 +132,7 @@ Elasticsearch 5.3.1.
 
 ////////////////////////
 
+include::release-notes/8.18.2.adoc[]
 include::release-notes/8.18.1.adoc[]
 include::release-notes/8.18.0.adoc[]
 include::release-notes/8.17.6.adoc[]