fix(Elasticsearch Node): fix pagination issue

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

@@ -36,6 +36,69 @@ export async function elasticsearchApiRequest(
 
 	try {
 		return await this.helpers.requestWithAuthentication.call(this, 'elasticsearchApi', options);
+	} catch (error) {
+		throw new NodeApiError(this.getNode(), error);
+	}
+}
+
+export async function elasticsearchApiRequestAllItems(
+	this: IExecuteFunctions,
+	indexId: string,
+	body: IDataObject = {},
+	qs: IDataObject = {},
+): Promise<any> { //tslint:disable-line:no-any
+	//https://www.elastic.co/guide/en/elasticsearch/reference/7.16/paginate-search-results.html#search-after
+	try {
+		//create a point in time (PIT) to preserve the current index state over your searches
+		let pit = (
+			await elasticsearchApiRequest.call(this, 'POST', `/${indexId}/_pit`, {}, { keep_alive: '1m' })
+		)?.id as string;
+
+		let returnData: IDataObject[] = [];
+		let responseData;
+		let searchAfter: string[] = [];
+
+		const requestBody: IDataObject = {
+			...body,
+			size: 10000,
+			pit: {
+				id: pit,
+				keep_alive: '1m',
+			},
+			track_total_hits: false, //Disable the tracking of total hits to speed up pagination
+		};
+
+		responseData = await elasticsearchApiRequest.call(this, 'GET', `/_search`, requestBody, qs);
+		if (responseData?.hits?.hits) {
+			returnData = returnData.concat(responseData.hits.hits);
+			const lastHitIndex = responseData.hits.hits.length - 1;
+			//Sort values for the last returned hit with the tiebreaker value
+			searchAfter = responseData.hits.hits[lastHitIndex].sort;
+			//Update id for the point in time
+			pit = responseData.pit_id;
+		} else {
+			return [];
+		}
+
+		while (true) {
+			requestBody.search_after = searchAfter;
+			requestBody.pit = { id: pit, keep_alive: '1m' };
+
+			responseData = await elasticsearchApiRequest.call(this, 'GET', `/_search`, requestBody, qs);
+
+			if (responseData?.hits?.hits?.length) {
+				returnData = returnData.concat(responseData.hits.hits);
+				const lastHitIndex = responseData.hits.hits.length - 1;
+				searchAfter = responseData.hits.hits[lastHitIndex].sort;
+				pit = responseData.pit_id;
+			} else {
+				break;
+			}
+		}
+
+		await elasticsearchApiRequest.call(this, 'DELETE', `/_pit`, { id: pit });
+
+		return returnData;
 	} catch (error) {
 		throw new NodeApiError(this.getNode(), error as JsonObject);
 	}