Fix visibility of sampling config rest specs (#137224)

Author: seanzatzdev

rest-api-spec/src/main/resources/rest-api-spec/api/indices.delete_sample_configuration.json

@@ -5,7 +5,8 @@
       "description": "Delete sampling configuration for an index or data stream"
     },
     "stability": "experimental",
-    "visibility": "public",
+    "visibility": "feature_flag",
+    "feature_flag": "random_sampling",
     "headers": {
       "accept": [
         "application/json"

rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_all_sample_configuration.json

@@ -5,7 +5,8 @@
       "description": "Get sampling configurations for all indices and data streams"
     },
     "stability": "experimental",
-    "visibility": "public",
+    "visibility": "feature_flag",
+    "feature_flag": "random_sampling",
     "headers": {
       "accept": [
         "application/json"

rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_sample_configuration.json

@@ -5,7 +5,8 @@
       "description": "Get sampling configuration for an index or data stream"
     },
     "stability": "experimental",
-    "visibility": "public",
+    "visibility": "feature_flag",
+    "feature_flag": "random_sampling",
     "headers": {
       "accept": [
         "application/json"

rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_sample_configuration.json

@@ -5,7 +5,8 @@
       "description": "Configure sampling for an index or data stream"
     },
     "stability": "experimental",
-    "visibility": "public",
+    "visibility": "feature_flag",
+    "feature_flag": "random_sampling",
     "headers": {
       "accept": [
         "application/json"