[Backport 9.2] Add transform.get_node_stats API

specification/_doc_ids/table.csv

@@ -263,6 +263,7 @@ get-features-api,https://www.elastic.co/docs/api/doc/elasticsearch/operation/ope
 get-global-checkpoints,https://www.elastic.co/docs/api/doc/elasticsearch/group/endpoint-fleet,https://www.elastic.co/guide/en/elasticsearch/reference/8.18/fleet-apis.html,
 get-license,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-license-get,https://www.elastic.co/guide/en/elasticsearch/reference/8.18/get-license.html,
 get-ml-info,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-info,https://www.elastic.co/guide/en/elasticsearch/reference/8.18/get-ml-info.html,
+get-node-stats,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-transform-get-node-stats,,
 get-pipeline-api,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-get-pipeline,https://www.elastic.co/guide/en/elasticsearch/reference/8.18/get-pipeline-api.html,
 get-repositories-metering-api,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-nodes-get-repositories-metering-info,https://www.elastic.co/guide/en/elasticsearch/reference/8.18/get-repositories-metering-api.html,
 get-synonym-rule,https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-synonyms-get-synonym-rule,https://www.elastic.co/guide/en/elasticsearch/reference/8.18/get-synonym-rule.html,

specification/transform/get_node_stats/GetNodeStatsRequest.ts

@@ -0,0 +1,38 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { RequestBase } from '@_types/Base'
+
+/**
+ * Get node stats.
+ *
+ * Get per-node information about transform usage.
+ * @rest_spec_name transform.get_node_stats
+ * @availability stack since=8.15.0 stability=stable
+ * @availability serverless stability=stable visibility=public
+ * @doc_id get-node-stats
+ */
+export interface Request extends RequestBase {
+  urls: [
+    {
+      path: '/_transform/_node_stats'
+      methods: ['GET']
+    }
+  ]
+}

specification/transform/get_node_stats/GetNodeStatsResponse.ts

@@ -0,0 +1,25 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { TransformNodeStats } from './types'
+
+export class Response {
+  /** @codegen_name stats */
+  body: TransformNodeStats
+}

specification/transform/get_node_stats/types.ts

@@ -0,0 +1,40 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { NodeId } from '@_types/common'
+import { integer } from '@_types/Numeric'
+import { AdditionalProperties } from '@spec_utils/behaviors'
+
+/**
+ * @behavior_meta AdditionalProperties fieldname=nodes description="Per node statistics"
+ */
+export class TransformNodeStats
+  implements AdditionalProperties<NodeId, Scheduler>
+{
+  total: Scheduler
+}
+
+export interface Scheduler {
+  scheduler: TransformNodeStatsDetails
+}
+
+export interface TransformNodeStatsDetails {
+  registered_transform_count: integer
+  peek_transform?: string
+}