[DOCS] Add get snapshot repo API docs (#57150)

docs/reference/snapshot-restore/apis/get-repo-api.asciidoc

@@ -0,0 +1,132 @@
+[[get-snapshot-repo-api]]
+=== Get snapshot repository API
+++++
+<titleabbrev>Get snapshot repository</titleabbrev>
+++++
+
+Gets information about one or more registered
+<<snapshots-register-repository,snapshot repositories>>.
+
+////
+[source,console]
+----
+PUT /_snapshot/my_repository
+{
+  "type": "fs",
+  "settings": {
+    "location": "my_backup_location"
+  }
+}
+----
+// TESTSETUP
+////
+
+[source,console]
+----
+GET /_snapshot/my_repository
+----
+
+[[get-snapshot-repo-api-request]]
+==== {api-request-title}
+
+`GET /_snapshot/<repository>`
+
+`GET /_snapshot`
+
+[[get-snapshot-repo-api-path-params]]
+==== {api-path-parms-title}
+
+`<repository>`::
+(Required, string)
+Comma-separated list of snapshot repository names used to limit the request.
+Wildcard (`*`) expressions are supported.
++
+To get information about all snapshot repositories registered in the
+cluster, omit this parameter or use `*` or `_all`.
+
+[[get-snapshot-repo-api-query-params]]
+==== {api-query-parms-title}
+
+`local`::
+(Optional, boolean) If `true`, the request gets information from the local node
+only. If `false`, the request gets information from the master node. Defaults to
+`false`.
+
+`master_timeout`::
+(Optional, <<time-units, time units>>) Specifies the period of time to wait for
+a connection to the master node. If no response is received before the timeout
+expires, the request fails and returns an error. Defaults to `30s`.
+
+[role="child_attributes"]
+[[get-snapshot-repo-api-response-body]]
+==== {api-response-body-title}
+
+`<repository>`::
+(object)
+Contains information about the snapshot repository. Key is the name of the
+snapshot repository.
++
+.Properties of `<repository>`
+[%collapsible%open]
+====
+`type`::
++
+--
+(string)
+Repository type.
+
+.Values for `type`
+[%collapsible%open]
+=====
+`fs`::
+Shared file system repository. See <<snapshots-filesystem-repository>>.
+
+[xpack]#`source`#::
+Source-only repository. See <<snapshots-source-only-repository>>.
+
+`url`::
+URL repository. See <<snapshots-read-only-repository>>.
+=====
+
+More repository types are available through these official plugins:
+
+* {plugins}/repository-s3.html[repository-s3] for S3 repository support
+* {plugins}/repository-hdfs.html[repository-hdfs] for HDFS repository support in
+  Hadoop environments
+* {plugins}/repository-azure.html[repository-azure] for Azure storage
+  repositories
+* {plugins}/repository-gcs.html[repository-gcs] for Google Cloud Storage
+  repositories
+--
+
+`settings`::
+(object)
+Contains settings for the repository. Valid properties for the `settings` object
+depend on the repository type, set using the
+<<put-snapshot-repo-api-request-type,`type`>> parameter.
++
+For properties, see the <<put-snapshot-repo-api,put snapshot repository API>>'s
+<<put-snapshot-repo-api-settings-param,`settings` parameter>>.
+====
+
+[[get-snapshot-repo-api-example]]
+==== {api-examples-title}
+
+[source,console]
+----
+GET /_snapshot/my_repository
+----
+
+The API returns the following response:
+
+[source,console-result]
+----
+{
+  "my_repository" : {
+    "type" : "fs",
+    "settings" : {
+      "location" : "my_backup_location"
+    }
+  }
+}
+----

docs/reference/snapshot-restore/apis/put-repo-api.asciidoc

@@ -157,6 +157,7 @@ plugins:
   repositories
 --
 
+[[put-snapshot-repo-api-settings-param]]
 `settings`::
 +
 --

docs/reference/snapshot-restore/apis/snapshot-restore-apis.asciidoc

@@ -23,4 +23,5 @@ content may not be included yet.
 
 include::clean-up-repo-api.asciidoc[]
 include::delete-repo-api.asciidoc[]
+include::get-repo-api.asciidoc[]
 include::put-repo-api.asciidoc[]