[DOCS] Add "delete index template" API docs

docs/reference/indices.asciidoc

@@ -43,6 +43,11 @@ index settings, aliases, mappings, and index templates.
 * <<indices-update-settings>>
 * <<indices-get-settings>>
 * <<indices-analyze>>
+
+[float]
+[[index-templates]]
+=== Index templates:
+* <<indices-delete-template>>
 * <<indices-templates>>
 
 [float]
@@ -103,6 +108,8 @@ include::indices/get-settings.asciidoc[]
 
 include::indices/analyze.asciidoc[]
 
+include::indices/delete-index-template.asciidoc[]
+
 include::indices/templates.asciidoc[]
 
 include::indices/stats.asciidoc[]

docs/reference/indices/delete-index-template.asciidoc

@@ -0,0 +1,48 @@
+[[indices-delete-template]]
+=== Delete index template API
+++++
+<titleabbrev>Delete template index</titleabbrev>
+++++
+
+Deletes an existing index.
+
+include::templates.asciidoc[tag=index-template-def]
+
+////
+[source,js]
+--------------------------------------------------
+PUT _template/template_1
+{
+ "index_patterns" : ["te*"],
+  "settings": {
+    "number_of_shards": 1
+  }
+}
+--------------------------------------------------
+// CONSOLE
+// TESTSETUP
+////
+
+[source,js]
+--------------------------------------------------
+DELETE /_template/template_1
+--------------------------------------------------
+// CONSOLE
+
+
+[[delete-template-api-request]]
+==== {api-request-title}
+
+`DELETE /_template/<index-template>`
+
+
+[[delete-template-api-path-params]]
+==== {api-path-parms-title}
+
+include::{docdir}/rest-api/common-parms.asciidoc[tag=index-template]
+
+
+[[delete-template-api-query-params]]
+==== {api-query-parms-title}
+
+include::{docdir}/rest-api/common-parms.asciidoc[tag=timeoutparms]

docs/reference/indices/templates.asciidoc

@@ -1,11 +1,13 @@
 [[indices-templates]]
 === Index Templates
 
+// tag::index-template-def[]
 Index templates allow you to define templates that will automatically be
 applied when new indices are created. The templates include both 
 <<index-modules-settings,settings>> and <<mapping,mappings>>
 and a simple pattern template that controls whether the template should be 
 applied to the new index.
+// end::index-template-def[]
 
 NOTE: Templates are only applied at index creation time. Changing a template
 will have no impact on existing indices. When using the create index API, the

docs/reference/rest-api/common-parms.asciidoc

@@ -88,6 +88,13 @@ tag::index[]
 used to limit the request.
 end::index[]
 
+tag::index-template[]
+`<index-template>`::
+(Required, string)
+Comma-separated list or wildcard expression of index template names
+used to limit the request.
+end::index-template[]
+
 tag::local[]
 `local`::
 (Optional, boolean) If `true`, the request retrieves information from the local