Elasticsearch: Discontinue EOL versions 7.0 and 7.1 support

Remove support for elasticsearch versions 7.0 and 7.1, as both became
EOL recently [1].

- Update the elasticsearch home page accordingly.
- Add that removal information to each next 3.x.y release notes.

[1] https://www.elastic.co/support/eol

Change-Id: I6eb757f538b0b529b23324a55c994c3d573163cf
diff --git a/pages/site/elasticsearch.md b/pages/site/elasticsearch.md
index 41c6ab4..2f14da5 100644
--- a/pages/site/elasticsearch.md
+++ b/pages/site/elasticsearch.md
@@ -18,9 +18,9 @@
 | 6.6.x                 | 3.0.0       | 3.1.0 | 3.2.0 | Support discontinued in 3.0.13, 3.1.9 and 3.2.4 |
 | 6.7.x                 | 3.0.0       | 3.1.0 | 3.2.0 | Support discontinued in 3.0.13, 3.1.9 and 3.2.4 |
 | 6.8.x                 | 3.0.2       | 3.1.0 | 3.2.0 | Support discontinued in 3.1.11, 3.2.6 and 3.3.1 |
-| 7.0.x                 | 3.0.0       | 3.1.0 | 3.2.0 | See note below about upgrades                   |
-| 7.1.x                 | 3.0.1       | 3.1.0 | 3.2.0 |                                                 |
-| 7.2.x                 | 3.0.2       | 3.1.0 | 3.2.0 |                                                 |
+| 7.0.x                 | 3.0.0       | 3.1.0 | 3.2.0 | Support discontinued in 3.1.11, 3.2.6 and 3.3.1 |
+| 7.1.x                 | 3.0.1       | 3.1.0 | 3.2.0 | Support discontinued in 3.1.11, 3.2.6 and 3.3.1 |
+| 7.2.x                 | 3.0.2       | 3.1.0 | 3.2.0 | See note below about upgrades                   |
 | 7.3.x                 | 3.0.2       | 3.1.0 | 3.2.0 |                                                 |
 | 7.4.x                 | 3.0.3       | 3.1.0 | 3.2.0 |                                                 |
 | 7.5.x                 | 3.0.5       | 3.1.1 | 3.2.0 |                                                 |
diff --git a/pages/site/releases/3.1.md b/pages/site/releases/3.1.md
index a419a7d..459730b 100644
--- a/pages/site/releases/3.1.md
+++ b/pages/site/releases/3.1.md
@@ -317,6 +317,10 @@
     Elasticsearch 6 in Gerrit. From this release, Gerrit no longer supports V6
     but only the already supported versions 7.x of Elasticsearch.
 
+    * Speaking of which, support for 7.0 and 7.1 is discontinued too, as both
+      elasticsearch versions also became [EOL](https://www.elastic.co/support/eol)
+      recently.
+
 ### 3.1.10
 
 * Breaking Changes
diff --git a/pages/site/releases/3.2.md b/pages/site/releases/3.2.md
index bfda5cb..afaf290 100644
--- a/pages/site/releases/3.2.md
+++ b/pages/site/releases/3.2.md
@@ -607,6 +607,10 @@
     Elasticsearch 6 in Gerrit. From this release, Gerrit no longer supports V6
     but only the already supported versions 7.x of Elasticsearch.
 
+    * Speaking of which, support for 7.0 and 7.1 is discontinued too, as both
+      elasticsearch versions also became [EOL](https://www.elastic.co/support/eol)
+      recently.
+
 ### 3.2.5.1
 
 * Bug Fixes
diff --git a/pages/site/releases/3.3.md b/pages/site/releases/3.3.md
index 432fc40..7c9918d 100644
--- a/pages/site/releases/3.3.md
+++ b/pages/site/releases/3.3.md
@@ -497,3 +497,7 @@
     6.8 is discontinued. This was the last supported minor version of
     Elasticsearch 6 in Gerrit. From this release, Gerrit no longer supports V6
     but only the already supported versions 7.x of Elasticsearch.
+
+    * Speaking of which, support for 7.0 and 7.1 is discontinued too, as both
+      elasticsearch versions also became [EOL](https://www.elastic.co/support/eol)
+      recently.