[DOCS] Add links to index APIs

Author: lcawl

docs/reference/graph/explore.asciidoc

@@ -2,6 +2,12 @@
 [[graph-explore-api]]
 == Graph explore API
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-graph[Graph explore APIs].
+--
+
 The graph explore API enables you to extract and summarize information about
 the documents and terms in an {es} data stream or index.
 

docs/reference/ilm/apis/ilm-api.asciidoc

@@ -1,6 +1,13 @@
 [[index-lifecycle-management-api]]
 == {ilm-cap} APIs
 
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-ilm[{ilm} APIs].
+--
+
+https://www.elastic.co/docs/api/doc/elasticsearch/group/endpoint-ilm
+
 You use the following APIs to set up policies to automatically manage the index lifecycle.
 For more information about {ilm} ({ilm-init}), see <<index-lifecycle-management>>.
 

docs/reference/indices.asciidoc

@@ -4,7 +4,7 @@
 .New API Reference
 [sidebar]
 --
-For the most up-to-date API details, refer to {api-es}/group/endpoint-document[document APIs].
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
 --
 
 Index APIs are used to manage individual indices,

docs/reference/indices/add-alias.asciidoc

@@ -4,6 +4,12 @@
 <titleabbrev>Create or update alias</titleabbrev>
 ++++
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Adds a data stream or index to an <<aliases,alias>>.
 
 [source,console]

docs/reference/indices/alias-exists.asciidoc

@@ -4,6 +4,12 @@
 <titleabbrev>Alias exists</titleabbrev>
 ++++
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Checks if an <<aliases,alias>> exists.
 
 [source,console]

docs/reference/indices/aliases.asciidoc

@@ -4,6 +4,12 @@
 <titleabbrev>Aliases</titleabbrev>
 ++++
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Performs one or more <<aliases,alias>> actions in a single atomic operation.
 
 [source,console]

docs/reference/indices/analyze.asciidoc

@@ -4,6 +4,12 @@
 <titleabbrev>Analyze</titleabbrev>
 ++++
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Performs <<analysis,analysis>> on a text string
 and returns the resulting tokens.
 

docs/reference/indices/apis/unfreeze.asciidoc

@@ -17,6 +17,12 @@ You can use this API to unfreeze indices that were frozen in 7.x. Frozen indices
 are not related to the frozen data tier.
 ====
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Unfreezes an index.
 
 [[unfreeze-index-api-request]]

docs/reference/indices/clearcache.asciidoc

@@ -4,6 +4,12 @@
 <titleabbrev>Clear cache</titleabbrev>
 ++++
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Clears the caches of one or more indices. For data streams, the API clears the
 caches of the stream's backing indices.
 

docs/reference/indices/clone-index.asciidoc

@@ -4,6 +4,12 @@
 <titleabbrev>Clone index</titleabbrev>
 ++++
 
+.New API Reference
+[sidebar]
+--
+For the most up-to-date API details, refer to {api-es}/group/endpoint-indices[index APIs].
+--
+
 Clones an existing index.
 
 [source,console]