Centralised doc versions in docs/Versions.asciidoc

docs/Versions.asciidoc

@@ -0,0 +1,43 @@
+:version:               6.0.0-alpha1
+:major-version:         6.x
+:lucene_version:        6.4.0
+:lucene_version_path:   6_4_0
+:branch:                master
+:jdk:                   1.8.0_73
+
+//////////
+release-state can be: released | prerelease | unreleased
+//////////
+
+:release-state:   unreleased
+
+:ref:             https://www.elastic.co/guide/en/elasticsearch/reference/{branch}
+:defguide:        https://www.elastic.co/guide/en/elasticsearch/guide/{branch}
+:plugins:         https://www.elastic.co/guide/en/elasticsearch/plugins/{branch}
+:javaclient:      https://www.elastic.co/guide/en/elasticsearch/client/java-api/{branch}
+:xpack:           https://www.elastic.co/guide/en/x-pack/5.0
+:issue:           https://github.com/elastic/elasticsearch/issues/
+:pull:            https://github.com/elastic/elasticsearch/pull/
+
+:docker-image:    docker.elastic.co/elasticsearch/elasticsearch:{version}
+:plugin_url:      https://artifacts.elastic.co/downloads/elasticsearch-plugins
+
+
+///////
+Javadoc roots used to generate links from Painless's API reference
+///////
+:java8-javadoc: https://docs.oracle.com/javase/8/docs/api
+:java9-javadoc: http://download.java.net/java/jigsaw/docs/api
+:joda-time-javadoc: http://www.joda.org/joda-time/apidocs
+:lucene-core-javadoc: http://lucene.apache.org/core/{lucene_version_path}/core
+
+ifeval::["{release-state}"=="unreleased"]
+:elasticsearch-javadoc: https://snapshots.elastic.co/javadoc/org/elasticsearch/elasticsearch/{version}-SNAPSHOT
+:painless-javadoc: https://snapshots.elastic.co/javadoc/org/elasticsearch/painless/lang-painless/{version}-SNAPSHOT
+endif::[]
+
+ifeval::["{release-state}"!="unreleased"]
+:elasticsearch-javadoc: https://artifacts.elastic.co/javadoc/org/elasticsearch/elasticsearch/{version}
+:painless-javadoc: https://artifacts.elastic.co/javadoc/org/elasticsearch/painless/lang-painless/{version}
+endif::[]
+

docs/java-api/index.asciidoc

@@ -1,7 +1,7 @@
 [[java-api]]
 = Java API
-:ref: http://www.elastic.co/guide/en/elasticsearch/reference/master
+
-:version: 6.0.0-alpha1
+include::../Versions.asciidoc[]
 
 [preface]
 == Preface

docs/java-rest/index.asciidoc

@@ -1,7 +1,7 @@
 [[java-rest]]
 = Java REST Client
 
-:version: 6.0.0-alpha1
+include::../Versions.asciidoc[]
 
 include::overview.asciidoc[]
 

docs/plugins/index.asciidoc

@@ -1,10 +1,6 @@
 = Elasticsearch Plugins and Integrations
 
-:ref:            https://www.elastic.co/guide/en/elasticsearch/reference/master
+include::../Versions.asciidoc[]
-:guide:          https://www.elastic.co/guide
-:version:        6.0.0-alpha1
-:lucene_version: 6.3.0
-:plugin_url:      https://artifacts.elastic.co/downloads/elasticsearch-plugins
 
 [[intro]]
 == Introduction to plugins

docs/reference/index.asciidoc

@@ -1,44 +1,7 @@
 [[elasticsearch-reference]]
 = Elasticsearch Reference
 
-:version:        6.0.0-alpha1
+include::../Versions.asciidoc[]
-:major-version:  6.x
-:docker-image: docker.elastic.co/elasticsearch/elasticsearch:{version}
-:x-pack-baseurl: https://www.elastic.co/guide/en/x-pack/5.0
-
-//////////
-release-state can be: released | prerelease | unreleased
-//////////
-
-:release-state:  unreleased
-:lucene_version: 6.3.0
-:branch:         master
-:jdk:            1.8.0_73
-:defguide:       https://www.elastic.co/guide/en/elasticsearch/guide/master
-:plugins:        https://www.elastic.co/guide/en/elasticsearch/plugins/master
-:javaclient:     https://www.elastic.co/guide/en/elasticsearch/client/java-api/master/
-:issue:          https://github.com/elastic/elasticsearch/issues/
-:pull:           https://github.com/elastic/elasticsearch/pull/
-
-
-///////
-Javadoc roots used to generate links from Painless's API reference
-///////
-:java8-javadoc: https://docs.oracle.com/javase/8/docs/api
-:java9-javadoc: http://download.java.net/java/jigsaw/docs/api
-:joda-time-javadoc: http://www.joda.org/joda-time/apidocs
-:lucene-core-javadoc: http://lucene.apache.org/core/6_4_0/core
-
-ifeval::["{release-state}"=="unreleased"]
-:elasticsearch-javadoc: https://snapshots.elastic.co/javadoc/org/elasticsearch/elasticsearch/{version}-SNAPSHOT
-:painless-javadoc: https://snapshots.elastic.co/javadoc/org/elasticsearch/painless/lang-painless/{version}-SNAPSHOT
-endif::[]
-
-ifeval::["{release-state}"!="unreleased"]
-:elasticsearch-javadoc: https://artifacts.elastic.co/javadoc/org/elasticsearch/elasticsearch/{version}
-:painless-javadoc: https://artifacts.elastic.co/javadoc/org/elasticsearch/painless/lang-painless/{version}
-endif::[]
-
 
 
 include::getting-started.asciidoc[]

docs/reference/setup/install/docker.asciidoc

@@ -2,14 +2,14 @@
 === Install Elasticsearch with Docker
 
 Elasticsearch is also available as a Docker image.
-The image is built with {x-pack-baseurl}/index.html[X-Pack].
+The image is built with {xpack}/index.html[X-Pack].
 
 ==== Security note
 
-NOTE: {x-pack-baseurl}/index.html[X-Pack] is preinstalled in this image.
+NOTE: {xpack}/index.html[X-Pack] is preinstalled in this image.
-Please take a few minutes to familiarize yourself with {x-pack-baseurl}/security-getting-started.html[X-Pack Security] and how to change default passwords. The default password for the `elastic` user is `changeme`.
+Please take a few minutes to familiarize yourself with {xpack}/security-getting-started.html[X-Pack Security] and how to change default passwords. The default password for the `elastic` user is `changeme`.
 
-NOTE: X-Pack includes a trial license for 30 days. After that, you can obtain one of the https://www.elastic.co/subscriptions[available subscriptions] or {x-pack-baseurl}/security-settings.html[disable Security]. The Basic license is free and includes the https://www.elastic.co/products/x-pack/monitoring[Monitoring] extension.
+NOTE: X-Pack includes a trial license for 30 days. After that, you can obtain one of the https://www.elastic.co/subscriptions[available subscriptions] or {xpack}/security-settings.html[disable Security]. The Basic license is free and includes the https://www.elastic.co/products/x-pack/monitoring[Monitoring] extension.
 
 Obtaining Elasticsearch for Docker is as simple as issuing a +docker pull+ command against the Elastic Docker registry.