Add ml.update_trained_model_deployment API (#2564)

(cherry picked from commit 4195183)

specification/ml/update_trained_model_deployment/MlUpdateTrainedModelDeploymentRequest.ts

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+/*
+ * 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'
+import { Id } from '@_types/common'
+import { integer } from '@_types/Numeric'
+
+/**
+ * Starts a trained model deployment, which allocates the model to every machine learning node.
+ * @rest_spec_name ml.update_trained_model_deployment
+ * @availability stack since=8.6.0 stability=stable
+ * @availability serverless stability=beta visibility=public
+ * @cluster_privileges manage_ml
+ */
+export interface Request extends RequestBase {
+  path_parts: {
+    /**
+     * The unique identifier of the trained model. Currently, only PyTorch models are supported.
+     */
+    model_id: Id
+  }
+  body: {
+    /**
+     * The number of model allocations on each node where the model is deployed.
+     * All allocations on a node share the same copy of the model in memory but use
+     * a separate set of threads to evaluate the model.
+     * Increasing this value generally increases the throughput.
+     * If this setting is greater than the number of hardware threads
+     * it will automatically be changed to a value less than the number of hardware threads.
+     * @server_default 1
+     */
+    number_of_allocations?: integer
+  }
+}

specification/ml/update_trained_model_deployment/MlUpdateTrainedModelDeploymentResponse.ts

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+/*
+ * 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 { TrainedModelAssignment } from '../_types/TrainedModel'
+
+export class Response {
+  body: {
+    assignment: TrainedModelAssignment
+  }
+}