Bumped version in docs

docs/groovy-api/index.asciidoc

@@ -1,7 +1,7 @@
 = Groovy API
 :ref:  http://www.elastic.co/guide/en/elasticsearch/reference/current
 :java: http://www.elastic.co/guide/en/elasticsearch/client/java-api/current
-:version: 5.0.0-alpha4
+:version: 5.0.0-alpha5
 
 [preface]
 == Preface

docs/java-api/index.asciidoc

@@ -1,7 +1,7 @@
 [[java-api]]
 = Java API
 :ref: http://www.elastic.co/guide/en/elasticsearch/reference/master
-:version: 5.0.0-alpha4
+:version: 5.0.0-alpha5
 
 [preface]
 == Preface

docs/java-rest/index.asciidoc

@@ -1,7 +1,7 @@
 [[java-rest]]
 = Java REST Client
 
-:version: 5.0.0-alpha4
+:version: 5.0.0-alpha5
 
 include::overview.asciidoc[]
 

docs/reference/index.asciidoc

@@ -1,7 +1,7 @@
 [[elasticsearch-reference]]
 = Elasticsearch Reference
 
-:version:       5.0.0-alpha4
+:version:       5.0.0-alpha5
 :major-version: 5.x
 :branch:        master
 :jdk:           1.8.0_73