Adds request params docs.

Author: szabosteve

specification/inference/_types/CommonTypes.ts

@@ -758,6 +758,136 @@ export class CohereTaskSettings {
   truncate?: CohereTruncateType
 }
 
+export class CustomServiceSettings {
+  /**
+   * Specifies the HTTPS header parameters – such as `Authentication` or `Contet-Type` – that are required to access the custom service.
+   * For example:
+   * ```
+   * "headers":{
+   *   "Authorization": "Bearer ${api_key}",
+   *   "Content-Type": "application/json;charset=utf-8"
+   * }
+   * ```
+   */
+  headers?: object
+  /**
+   * The request configuration object.
+   */
+  request: CustomRequestParams
+  /**
+   * The response configuration object.
+   */
+  response: CustomResponseParams
+  /**
+   * Specifies secret parameters, like `api_key` or `api_token`, that are required to access the custom service.
+   * For example:
+   * ```
+   * "secret_parameters":{
+   *   "api_key":"<api_key>"
+   * }
+   * ```
+   */
+  secret_parameters: object
+  /**
+   * The URL endpoint to use for the requests.
+   */
+  url?: string
+}
+
+export class CustomRequestParams {
+  /**
+   * The body structure of the request. It requires passing in the string-escaped result of the JSON format HTTP request body.
+   * For example:
+   * ```
+   * "request":{
+   *   "content":"{\"input\":${input}}"
+   * }
+   * ```
+   * > info
+   * > The content string needs to be a single line except using the Kibana console.
+   */
+  content: string
+} 
+
+export class CustomResponseParams {
+  /**
+   * Specifies the path to the error message in the response from the custom service.
+   * For example:
+   * ```
+   * "response": {
+   *   "error_parser": {
+   *     "path": "$.error.message"
+   *   }
+   * }
+   * ```
+   */
+  error_parser: object
+  /** 
+   * Specifies the JSON parser that is used to parse the response from the custom service.
+   * Different task types require different json_parser parameters.
+   * For example:
+   * ```
+   * # text_embedding
+   * "response":{
+   *   "json_parser":{
+   *     "text_embeddings":"$.result.embeddings[*].embedding"
+   *   }
+   * }
+   * 
+   * # sparse_embedding
+   * "response":{
+   *   "json_parser":{
+   *     "token_path":"$.result[*].embeddings[*].token",
+   *     "weight_path":"$.result[*].embeddings[*].weight"
+   *   }
+   * }
+   * 
+   * # rerank
+   * "response":{
+   *   "json_parser":{
+   *     "reranked_index":"$.result.scores[*].index",    // optional
+   *     "relevance_score":"$.result.scores[*].score",
+   *     "document_text":"xxx"    // optional
+   *   }
+   * }
+   * 
+   * # completion
+   * "response":{
+   *   "json_parser":{
+   *     "completion_result":"$.result.text"
+   *   }
+   * }
+   */
+  json_parser: object
+}
+
+export enum CustomTaskType {
+  text_embedding,
+  sparse_embedding,
+  rerank,
+  completion
+}
+
+export enum CustomServiceType {
+  custom
+}
+
+export class CustomTaskSettings {
+  /**
+   * Specifies parameters that are required to run the custom service. The parameters depend on the model your custom service uses.
+   * For example:
+   * ```
+   * "task_settings":{
+   *   "parameters":{
+   *     "input_type":"query",
+   *     "return_token":true
+   *   }
+   * }
+   * ```
+   */
+  parameters?: object
+}
+
 export class EisServiceSettings {
   /**
    * The name of the model to use for the inference task.

specification/inference/put_custom/PutCustomRequest.ts

@@ -0,0 +1,78 @@
+/*
+ * 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 {
+  CustomServiceSettings,
+  CustomServiceType,
+  CustomTaskSettings,
+  CustomTaskType
+} from '@inference/_types/CommonTypes'
+import { InferenceChunkingSettings } from '@inference/_types/Services'
+
+/**
+ * Create a custom inference endpoint.
+ *
+ * You can create an inference endpoint to perform an inference task with a custom model that supports the HTTP format.
+ * @rest_spec_name inference.put_custom
+ * @availability stack since=8.13.0 stability=stable visibility=public
+ * @availability serverless stability=stable visibility=public
+ * @cluster_privileges manage_inference
+ * @doc_id inference-api-put-custom
+ */
+export interface Request extends RequestBase {
+  urls: [
+    {
+      path: '/_inference/{task_type}/{custom_inference_id}'
+      methods: ['PUT']
+    }
+  ]
+  path_parts: {
+    /**
+     * The type of the inference task that the model will perform.
+     */
+    task_type: CustomTaskType
+    /**
+     * The unique identifier of the inference endpoint.
+     */
+    custom_inference_id: Id
+  }
+  body: {
+    /**
+     * The chunking configuration object.
+     * @ext_doc_id inference-chunking
+     */
+    chunking_settings?: InferenceChunkingSettings
+    /**
+     * The type of service supported for the specified task type. In this case, `custom`.
+     */
+    service: CustomServiceType
+    /**
+     * Settings used to install the inference model.
+     * These settings are specific to the `custom` service.
+     */
+    service_settings: CustomServiceSettings
+    /**
+     * Settings to configure the inference task.
+     * These settings are specific to the task type you specified.
+     */
+    task_settings?: CustomTaskSettings
+  }
+}