[DOCS] Add index-all.asciidoc for build purposes (#25186)

Author: lcawl

docs/reference/index-all.asciidoc

@@ -0,0 +1,4 @@
+[[elasticsearch-reference]]
+= Elasticsearch Reference
+
+include::index-shared.asciidoc[]

docs/reference/index-shared.asciidoc

@@ -0,0 +1,37 @@
+
+:version:   1.5.2
+:branch:    1.5
+:jdk:       1.8.0_25
+:defguide:  https://www.elastic.co/guide/en/elasticsearch/guide/current
+
+include::getting-started.asciidoc[]
+
+include::setup.asciidoc[]
+
+include::migration/index.asciidoc[]
+
+include::api-conventions.asciidoc[]
+
+include::docs.asciidoc[]
+
+include::search.asciidoc[]
+
+include::indices.asciidoc[]
+
+include::cat.asciidoc[]
+
+include::cluster.asciidoc[]
+
+include::query-dsl.asciidoc[]
+
+include::mapping.asciidoc[]
+
+include::analysis.asciidoc[]
+
+include::modules.asciidoc[]
+
+include::index-modules.asciidoc[]
+
+include::testing.asciidoc[]
+
+include::glossary.asciidoc[]

docs/reference/index.asciidoc

@@ -1,42 +1,4 @@
 [[elasticsearch-reference]]
 = Elasticsearch Reference
 
-:version:   1.5.2
-:branch:    1.5
-:jdk:       1.8.0_25
-:defguide:  https://www.elastic.co/guide/en/elasticsearch/guide/current
-
-include::getting-started.asciidoc[]
-
-include::setup.asciidoc[]
-
-include::migration/index.asciidoc[]
-
-include::api-conventions.asciidoc[]
-
-include::docs.asciidoc[]
-
-include::search.asciidoc[]
-
-include::indices.asciidoc[]
-
-include::cat.asciidoc[]
-
-include::cluster.asciidoc[]
-
-include::query-dsl.asciidoc[]
-
-include::mapping.asciidoc[]
-
-include::analysis.asciidoc[]
-
-include::modules.asciidoc[]
-
-include::index-modules.asciidoc[]
-
-include::testing.asciidoc[]
-
-include::glossary.asciidoc[]
-
-
-
+include::index-shared.asciidoc[]