@opensearch-project/opensearch

--- package/package.json (excerpt) ---
{
  "name": "@opensearch-project/opensearch",
  "description": "The official OpenSearch client for Node.js",
  "main": "index.js",
  "types": "index.d.ts",
  "exports": {
    ".": {
      "require": "./index.js",
      "types": "./index.d.ts",
      "import": "./index.mjs"
    },
    "./aws": "./lib/aws/index.js",
    "./aws-v3": "./lib/aws/index-v3.js",
    "./*": "./*"
  },
  "typesVersions": {
    "*": {
      ".": [
        "index.d.ts"
      ],
      "aws": [
        "./lib/aws/index.d.ts"
      ],
      "aws-v3": [
        "./lib/aws/index-v3.d.ts"
      ]
    }
  },
  "files": [
    "api/",
    "lib/",
    "index.d.ts",
    "index.js",
    "index.mjs",
    "README.md",
    "LICENSE.txt"
  ],
  "homepage": "https://www.opensearch.org/",
  "version": "3.6.0",
  "versionCanary": "7.10.0-canary.6",
  "keywords": [
    "opensearch",
    "opensearchDashboards",
    "mapping",
    "REST",
    "search",
    "client",
    "index"
  ],
  "scripts": {
    "test": "npm run lint && tap test/{unit,acceptance}/{*,**/*,**/**/*}.test.js && npm run test:types",
    "test:unit": "tap test/unit/{*,**/*,**/**/*}.test.js",
    "test:acceptance": "tap test/acceptance/*.test.js",
    "test:integration": "node test/integration/index.js",
    "test:integration:helpers": "tap test/integration/helpers/*.test.js",
    "test:integration:helpers-secure": "tap test/integration/helpers-secure/*.test.js",
    "test:types": "tsd",
    "test:coverage-90": "tap test/{unit,acceptance}/{*,**/*,**/**/*}.test

--- package/lib/Client.js (excerpt) ---
/*
 * Copyright OpenSearch Contributors
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 *
 */

/*
 * 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.
 */

'use strict';

const { EventEmitter } = require('events');
const { URL } = require('url');
const debug = require('debug')('opensearch');
const Transport = require('./Transport');
const Connection = require('./Connection');
const { ConnectionPool, CloudConnectionPool } = require('./pool');
const Helpers = require('./Helpers');
const Serializer = require('./Serializer');
const errors = require('./errors');
const { ConfigurationError } = errors;
const { 

--- package/lib/Transport.js (excerpt) ---
/*
 * Copyright OpenSearch Contributors
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 *
 */

/*
 * 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.
 */

'use strict';

const debug = require('debug')('opensearch');
const os = require('os');
const { gzip, unzip, createGzip } = require('zlib');
const buffer = require('buffer');
const ms = require('ms');
const { EventEmitter } = require('events');
const {
  ConnectionError,
  RequestAbortedError,
  NoLivingConnectionsError,
  ResponseError,
  ConfigurationError,
} = require('./errors');

const noop = () => {};

const compatibleCheckEmitter = new EventEmit