[DOCS] Add 8.18.7 release notes (#2452)

Author: jbaiera

docs/src/reference/asciidoc/appendix/release-notes/8.18.7.adoc

@@ -0,0 +1,5 @@
+[[eshadoop-8.18.7]]
+== Elasticsearch for Apache Hadoop version 8.18.7
+
+ES-Hadoop 8.18.7 is a version compatibility release, tested specifically against
+Elasticsearch 8.18.7.

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

@@ -13,6 +13,7 @@ This section summarizes the changes in each release.
 * <<eshadoop-8.19.2>>
 * <<eshadoop-8.19.1>>
 * <<eshadoop-8.19.0>>
+* <<eshadoop-8.18.7>>
 * <<eshadoop-8.18.6>>
 * <<eshadoop-8.18.5>>
 * <<eshadoop-8.18.4>>
@@ -148,6 +149,7 @@ include::release-notes/8.19.3.adoc[]
 include::release-notes/8.19.2.adoc[]
 include::release-notes/8.19.1.adoc[]
 include::release-notes/8.19.0.adoc[]
+include::release-notes/8.18.7.adoc[]
 include::release-notes/8.18.6.adoc[]
 include::release-notes/8.18.5.adoc[]
 include::release-notes/8.18.4.adoc[]