[DOCS] Add 8.7.0 release notes (#2073) (#2074)

Author: masseyke

docs/src/reference/asciidoc/appendix/release-notes/8.7.0.adoc

@@ -0,0 +1,5 @@
+[[eshadoop-8.7.0]]
+== Elasticsearch for Apache Hadoop version 8.7.0
+
+ES-Hadoop 8.7.0 is a version compatibility release, tested specifically against
+Elasticsearch 8.7.0.

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-8.7.0>>
 * <<eshadoop-8.6.2>>
 * <<eshadoop-8.6.1>>
 * <<eshadoop-8.6.0>>
@@ -81,6 +82,7 @@ Elasticsearch 5.3.1.
 
 ////////////////////////
 
+include::release-notes/8.7.0.adoc[]
 include::release-notes/8.6.2.adoc[]
 include::release-notes/8.6.1.adoc[]
 include::release-notes/8.6.0.adoc[]