Docs: Clarify we only support java 8

For versions before 6.2, Elasticsearch only supports Java 8.

Closes #31219

Author: nik9000

docs/reference/setup/install/deb.asciidoc

@@ -9,7 +9,7 @@ The latest stable version of Elasticsearch can be found on the
 link:/downloads/elasticsearch[Download Elasticsearch] page. Other versions can
 be found on the link:/downloads/past-releases[Past Releases page].
 
-NOTE: Elasticsearch requires Java 8 or later. Use the
+NOTE: Elasticsearch requires Java 8. Use the
 http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
 or an open-source distribution such as http://openjdk.java.net[OpenJDK].
 

docs/reference/setup/install/rpm.asciidoc

@@ -13,7 +13,7 @@ The latest stable version of Elasticsearch can be found on the
 link:/downloads/elasticsearch[Download Elasticsearch] page. Other versions can
 be found on the link:/downloads/past-releases[Past Releases page].
 
-NOTE: Elasticsearch requires Java 8 or later. Use the
+NOTE: Elasticsearch requires Java 8. Use the
 http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
 or an open-source distribution such as http://openjdk.java.net[OpenJDK].
 

docs/reference/setup/install/windows.asciidoc

@@ -15,7 +15,7 @@ link:/downloads/elasticsearch[Download Elasticsearch] page.
 Other versions can be found on the
 link:/downloads/past-releases[Past Releases page].
 
-NOTE: Elasticsearch requires Java 8 or later. Use the
+NOTE: Elasticsearch requires Java 8. Use the
 http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
 or an open-source distribution such as http://openjdk.java.net[OpenJDK].
 

docs/reference/setup/install/zip-targz.asciidoc

@@ -10,7 +10,7 @@ link:/downloads/elasticsearch[Download Elasticsearch] page.
 Other versions can be found on the
 link:/downloads/past-releases[Past Releases page].
 
-NOTE: Elasticsearch requires Java 8 or later. Use the
+NOTE: Elasticsearch requires Java 8. Use the
 http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
 or an open-source distribution such as http://openjdk.java.net[OpenJDK].
 
@@ -195,4 +195,4 @@ directory so that you do not delete important data later on.
 |=======================================================================
 
 
-include::next-steps.asciidoc[]
+include::next-steps.asciidoc[]

docs/reference/setup/install/zip-windows.asciidoc

@@ -14,7 +14,7 @@ link:/downloads/elasticsearch[Download Elasticsearch] page.
 Other versions can be found on the
 link:/downloads/past-releases[Past Releases page].
 
-NOTE: Elasticsearch requires Java 8 or later. Use the
+NOTE: Elasticsearch requires Java 8. Use the
 http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
 or an open-source distribution such as http://openjdk.java.net[OpenJDK].
 
@@ -266,4 +266,4 @@ directory so that you do not delete important data later on.
 
 |=======================================================================
 
-include::next-steps.asciidoc[]
+include::next-steps.asciidoc[]