✨ Add Elasticsearch node (#1791)

* 🎉 Initial node scaffolding

* ⚡ Implement index operations

* ⚡ Implement document operations

* 🔨 Clean up details

* 🔨 Fix casing

* 🔨 Fix indentation

* ⚡ Minor fixes

* ✏️ Update descriptions

* 🔥 Remove wrong placeholder

* ⚡ Refactor to implement specifyIndexBy

* 👕 Appease linter

* Revert "⚡ Refactor to implement specifyIndexBy"

This reverts commit 02ea0d30804b14f0b489678cd4e5deeb95848883.

* 🔥 Remove unused file

* ⚡ Return source always in document:get and getAll

* ⚡ Rename to options in document:getAll

* ⚡ Rename to options in document:get

* ⚡ Send content as JSON

* ⚡ Add simplify param to document:get

* ⚡ Rename docvalue fields

* ⚡ Make document ID optional in document:index

* ⚡ Implement sendInputData

* 👕 Fix lintings

* Add define and automap to document:index

* WIP on document:update

* 🔨 Adjust document:update per feedback

* 🔥 Remove logging

* ⚡ Improve Elasticsearch node

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

packages/nodes-base/nodes/Elasticsearch/GenericFunctions.ts

@@ -0,0 +1,58 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+	NodeApiError,
+} from 'n8n-workflow';
+
+import {
+	ElasticsearchApiCredentials,
+} from './types';
+
+export async function elasticsearchApiRequest(
+	this: IExecuteFunctions,
+	method: 'GET' | 'PUT' | 'POST' | 'DELETE',
+	endpoint: string,
+	body: IDataObject = {},
+	qs: IDataObject = {},
+) {
+	const {
+		username,
+		password,
+		baseUrl,
+	} = this.getCredentials('elasticsearchApi') as ElasticsearchApiCredentials;
+
+	const token = Buffer.from(`${username}:${password}`).toString('base64');
+
+	const options: OptionsWithUri = {
+		headers: {
+			Authorization: `Basic ${token}`,
+			'Content-Type': 'application/json',
+		},
+		method,
+		body,
+		qs,
+		uri: `${baseUrl}${endpoint}`,
+		json: true,
+	};
+
+	if (!Object.keys(body).length) {
+		delete options.body;
+	}
+
+	if (!Object.keys(qs).length) {
+		delete options.qs;
+	}
+
+	try {
+		return await this.helpers.request(options);
+	} catch (error) {
+		throw new NodeApiError(this.getNode(), error);
+	}
+}