Remove REST APIs documentation for experimental Searchable Snapshot APIs (#62217)

This commit removes the documentation for some specific Searchable Snapshot REST APIs:
- clear cache
- searchable snapshot stats
- repository stats

These APIs are low-level and are useful to investigate the behavior of snapshot 
backed indices but we expect them to be removed in the future or to appear in 
a different form.

docs/reference/rest-api/index.asciidoc

@@ -33,9 +33,7 @@ endif::[]
 * <<repositories-metering-apis,Repositories Metering APIs>>
 * <<rollup-apis,Rollup APIs>>
 * <<search, Search APIs>>
-ifdef::permanently-unreleased-branch[]
 * <<searchable-snapshots-apis, Searchable snapshots APIs>>
-endif::[]
 * <<security-api,Security APIs>>
 * <<snapshot-restore-apis,Snapshot and restore APIs>>
 * <<snapshot-lifecycle-management-api,Snapshot lifecycle management APIs>>

docs/reference/searchable-snapshots/apis/clear-cache.asciidoc

@@ -1,76 +0,0 @@
-[role="xpack"]
-[testenv="enterprise"]
-[[searchable-snapshots-api-clear-cache]]
-=== Clear cache API
-++++
-<titleabbrev>Clear cache</titleabbrev>
-++++
-
-experimental[]
-
-Clear the cache of searchable snapshots.
-
-[[searchable-snapshots-api-clear-cache-request]]
-==== {api-request-title}
-
-`POST /_searchable_snapshots/cache/clear`
-
-`POST /<target>/_searchable_snapshots/cache/clear`
-
-[[searchable-snapshots-api-clear-cache-prereqs]]
-==== {api-prereq-title}
-
-If the {es} {security-features} are enabled, you must have the
-`manage` cluster privilege and the `manage` index privilege
-for any included indices to use this API.
-For more information, see <<security-privileges>>.
-
-[[searchable-snapshots-api-clear-cache-desc]]
-==== {api-description-title}
-
-
-[[searchable-snapshots-api-clear-cache-path-params]]
-==== {api-path-parms-title}
-
-`<target>`::
-(Optional, string)
-A comma-separated list of data streams and indices for which the
-searchable snapshots cache must be cleared.
-
-
-[[searchable-snapshots-api-clear-cache-example]]
-==== {api-examples-title}
-////
-[source,console]
------------------------------------
-PUT /docs
-{
-  "settings" : {
-    "index.number_of_shards" : 1,
-    "index.number_of_replicas" : 0
-  }
-}
-
-PUT /_snapshot/my_repository/my_snapshot?wait_for_completion=true
-{
-  "include_global_state": false,
-  "indices": "docs"
-}
-
-DELETE /docs
-
-POST /_snapshot/my_repository/my_snapshot/_mount?wait_for_completion=true
-{
-  "index": "docs"
-}
------------------------------------
-// TEST[setup:setup-repository]
-////
-
-Clears the cache of the index `docs`:
-
-[source,console]
---------------------------------------------------
-POST /docs/_searchable_snapshots/cache/clear
---------------------------------------------------
-// TEST[continued]

docs/reference/searchable-snapshots/apis/get-stats.asciidoc

@@ -1,76 +0,0 @@
-[role="xpack"]
-[testenv="enterprise"]
-[[searchable-snapshots-api-stats]]
-=== Searchable snapshot statistics API
-++++
-<titleabbrev>Searchable snapshot statistics</titleabbrev>
-++++
-
-experimental[]
-
-Retrieve various statistics about searchable snapshots.
-
-[[searchable-snapshots-api-stats-request]]
-==== {api-request-title}
-
-`GET /_searchable_snapshots/stats`
-
-`GET /<target>/_searchable_snapshots/stats`
-
-[[searchable-snapshots-api-stats-prereqs]]
-==== {api-prereq-title}
-
-If the {es} {security-features} are enabled, you must have the
-`manage` cluster privilege and the `manage` index privilege
-for any included indices to use this API.
-For more information, see <<security-privileges>>.
-
-[[searchable-snapshots-api-stats-desc]]
-==== {api-description-title}
-
-
-[[searchable-snapshots-api-stats-path-params]]
-==== {api-path-parms-title}
-
-`<target>`::
-(Optional, string)
-A comma-separated list of data streams and indices for which the
-statistics must be retrieved.
-
-
-[[searchable-snapshots-api-stats-example]]
-==== {api-examples-title}
-////
-[source,console]
------------------------------------
-PUT /docs
-{
-  "settings" : {
-    "index.number_of_shards" : 1,
-    "index.number_of_replicas" : 0
-  }
-}
-
-PUT /_snapshot/my_repository/my_snapshot?wait_for_completion=true
-{
-  "include_global_state": false,
-  "indices": "docs"
-}
-
-DELETE /docs
-
-POST /_snapshot/my_repository/my_snapshot/_mount?wait_for_completion=true
-{
-  "index": "docs"
-}
------------------------------------
-// TEST[setup:setup-repository]
-////
-
-Retrieves the statistics of the index `docs`:
-
-[source,console]
---------------------------------------------------
-GET /docs/_searchable_snapshots/stats
---------------------------------------------------
-// TEST[continued]

docs/reference/searchable-snapshots/apis/mount-snapshot.asciidoc

@@ -8,7 +8,7 @@
 
 experimental[]
 
-Mount a snapshot as a searchable index.
+Mount a snapshot as a snapshot backed index.
 
 [[searchable-snapshots-api-mount-request]]
 ==== {api-request-title}

docs/reference/searchable-snapshots/apis/repository-stats.asciidoc

@@ -1,73 +0,0 @@
-[role="xpack"]
-[testenv="enterprise"]
-[[searchable-snapshots-repository-stats]]
-=== Searchable snapshot repository statistics API
-++++
-<titleabbrev>Searchable snapshot repository statistics</titleabbrev>
-++++
-
-experimental[]
-
-Retrieve usage statistics about a snapshot repository.
-
-[[searchable-snapshots-repository-stats-request]]
-==== {api-request-title}
-
-`GET /_snapshot/<repository>/_stats`
-
-[[searchable-snapshots-repository-stats-prereqs]]
-==== {api-prereq-title}
-
-If the {es} {security-features} are enabled, you must have the
-`manage` cluster privilege and the `manage` index privilege
-for any included indices to use this API.
-For more information, see <<security-privileges>>.
-
-[[searchable-snapshots-repository-stats-desc]]
-==== {api-description-title}
-
-
-[[searchable-snapshots-repository-stats-path-params]]
-==== {api-path-parms-title}
-
-`<repository>`::
-(Required, string)
-The repository for which to retrieve stats.
-
-
-[[searchable-snapshots-repository-stats-example]]
-==== {api-examples-title}
-////
-[source,console]
------------------------------------
-PUT /docs
-{
-  "settings" : {
-    "index.number_of_shards" : 1,
-    "index.number_of_replicas" : 0
-  }
-}
-
-PUT /_snapshot/my_repository/my_snapshot?wait_for_completion=true
-{
-  "include_global_state": false,
-  "indices": "docs"
-}
-
-DELETE /docs
-
-POST /_snapshot/my_repository/my_snapshot/_mount?wait_for_completion=true
-{
-  "index": "docs"
-}
------------------------------------
-// TEST[setup:setup-repository]
-////
-
-Retrieves the statistics of the repository `my_repository`:
-
-[source,console]
---------------------------------------------------
-GET /_snapshot/my_repository/_stats
---------------------------------------------------
-// TEST[continued]

docs/reference/searchable-snapshots/apis/searchable-snapshots-apis.asciidoc

@@ -8,11 +8,5 @@ experimental[]
 You can use the following APIs to perform searchable snapshots operations.
 
 * <<searchable-snapshots-api-mount-snapshot,Mount snapshot>>
-* <<searchable-snapshots-api-clear-cache,Clear cache>>
-* <<searchable-snapshots-api-stats,Get stats>>
-* <<searchable-snapshots-repository-stats,Repository stats>>
 
 include::mount-snapshot.asciidoc[]
-include::clear-cache.asciidoc[]
-include::get-stats.asciidoc[]
-include::repository-stats.asciidoc[]

x-pack/plugin/src/test/resources/rest-api-spec/api/searchable_snapshots.clear_cache.json

@@ -1,7 +1,7 @@
 {
   "searchable_snapshots.clear_cache": {
     "documentation": {
-      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/searchable-snapshots-api-clear-cache.html",
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/searchable-snapshots-apis.html",
       "description" : "Clear the cache of searchable snapshots."
     },
     "stability": "experimental",

x-pack/plugin/src/test/resources/rest-api-spec/api/searchable_snapshots.repository_stats.json

@@ -1,7 +1,7 @@
 {
   "searchable_snapshots.repository_stats": {
     "documentation": {
-      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/searchable-snapshots-repository-stats.html",
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/searchable-snapshots-apis.html",
       "description": "Retrieve usage statistics about a snapshot repository."
     },
     "stability": "experimental",

x-pack/plugin/src/test/resources/rest-api-spec/api/searchable_snapshots.stats.json

@@ -1,7 +1,7 @@
 {
   "searchable_snapshots.stats": {
     "documentation": {
-      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/searchable-snapshots-api-stats.html",
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/searchable-snapshots-apis.html",
       "description": "Retrieve various statistics about searchable snapshots."
     },
     "stability": "experimental",