Update rest-api-spec (#5448)

Co-authored-by: pquentin <[email protected]>

Author: github-actions[bot]

output/schema/schema.json

@@ -0,0 +1,27 @@
+{
+  "indices.get_sample_stats": {
+    "documentation": {
+      "url": "https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-sample",
+      "description": "Get stats about a random sample of ingested data"
+    },
+    "stability": "experimental",
+    "visibility": "public",
+    "headers": {
+      "accept": ["application/json"]
+    },
+    "url": {
+      "paths": [
+        {
+          "path": "/{index}/_sample/stats",
+          "methods": ["GET"],
+          "parts": {
+            "index": {
+              "type": "string",
+              "description": "The name of a data stream or index"
+            }
+          }
+        }
+      ]
+    }
+  }
+}