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+# Bulk
+
+In this guide, you'll learn how to use the OpenSearch JavaScript Client API to perform bulk operations. You'll learn how to index, update, and delete multiple documents in a single request.
+
+## Setup
+First, create a client instance with the following code:
+
+```javascript
+const { Client } = require('@opensearch-project/opensearch');
+
+const client = new Client({
+  node: 'http://localhost:9200',
+});
+```
+
+Next, create an index named `movies` and another named `books` with the default settings:
+
+```javascript
+const movies = 'movies';
+const books = 'books';
+
+client.indices.create({ index: movies }).then(() => {
+  console.log(`Index ${movies} created`);
+});
+
+client.indices.create({ index: books }).then(() => {
+  console.log(`Index ${books} created`);
+});
+```
+
+
+## Bulk API
+
+The `bulk` API action allows you to perform document operations in a single request. The body of the request is an array of objects that contains the bulk operations and the target documents to index, create, update, or delete.
+
+### Indexing multiple documents
+The following code creates two documents in the `movies` index and one document in the `books` index:
+
+```javascript
+client.bulk({
+  body: [
+    { index: { _index: movies, _id: 1 } },
+    { title: 'Beauty and the Beast', year: 1991 },
+    { index: { _index: movies, _id: 2 } },
+    { title: 'Beauty and the Beast - Live Action', year: 2017 },
+    { index: { _index: books, _id: 1 } },
+    { title: 'The Lion King', year: 1994 }
+  ]
+}).then((response) => {
+  console.log(response);
+});
+```
+As you can see, each bulk operation is comprised of two objects. The first object contains the operation type and the target document's `_index` and `_id`. The second object contains the document's data. As a result, the body of the request above contains six objects for three index actions.
+
+Alternatively, the `bulk` method can accept an array of hashes where each hash represents a single operation. The following code is equivalent to the previous example:
+
+```javascript
+client.bulk({
+  body: [
+    { index: { _index: movies, _id: 1, data: { title: 'Beauty and the Beast', year: 1991 }  } },
+    { index: { _index: movies, _id: 2, data: { title: 'Beauty and the Beast - Live Action', year: 2017 } } },
+    { index: { _index: books, _id: 1, data: { title: 'The Lion King', year: 1994 } } }
+  ]
+}).then((response) => {
+  console.log(response);
+});
+```
+
+We will use this format for the rest of the examples in this guide.
+
+### Creating multiple documents
+
+Similarly, instead of calling the `create` method for each document, you can use the `bulk` API to create multiple documents in a single request. The following code creates three documents in the `movies` index and one in the `books` index:
+
+```javascript
+client.bulk({
+  index: movies,
+  body: [
+    { create: { data: { title: 'Beauty and the Beast 2', year: 2030 } } },
+    { create: { data: { title: 'Beauty and the Beast 3', year: 2031 } } },
+    { create: { data: { title: 'Beauty and the Beast 4', year: 2049 } } },
+    { create: { _index: books, data: { title: 'The Lion King 2', year: 1998 } } }
+  ]
+}).then((response) => {
+  console.log(response);
+});
+```
+Note that we specified only the `_index` for the last document in the request body. This is because the `bulk` method accepts an `index` parameter that specifies the default `_index` for all bulk operations in the request body. Moreover, we omit the `_id` for each document and let OpenSearch generate them for us in this example, just like we can with the `create` method.
+
+### Updating multiple documents
+```javascript
+client.bulk({
+  index: movies,
+  body: [
+    { update: { _id: 1, data: { doc: { year: 1992 } } } },
+    { update: { _id: 2, data: { doc: { year: 2018 } } } }
+  ]
+}).then((response) => {
+  console.log(response);
+});
+```
+Note that the updated data is specified in the `doc` field of the `data` object.
+
+
+### Deleting multiple documents
+```javascript
+client.bulk({
+  index: movies,
+  body: [
+    { delete: { _id: 1 } },
+    { delete: { _id: 2 } }
+  ]
+}).then((response) => {
+  console.log(response);
+});
+```
+
+### Mix and match operations
+You can mix and match the different operations in a single request. The following code creates two documents, updates one document, and deletes another document:
+
+```javascript
+client.bulk({
+  index: movies,
+  body: [
+    { create: { data: { title: 'Beauty and the Beast 5', year: 2050 } } },
+    { create: { data: { title: 'Beauty and the Beast 6', year: 2051 } } },
+    { update: { _id: 3, data: { doc: { year: 2052 } } } },
+    { delete: { _id: 4 } }
+  ]
+}).then((response) => {
+  console.log(response);
+});
+```
+
+### Handling errors
+The `bulk` API returns an array of responses for each operation in the request body. Each response contains a `status` field that indicates whether the operation was successful or not. If the operation was successful, the `status` field is set to a `2xx` code. Otherwise, the response contains an error message in the `error` field.
+
+The following code shows how to look for errors in the response:
+
+```javascript
+client.bulk({
+  index: movies,
+  body: [
+    { create: { _id: 1, data: { title: 'Beauty and the Beast', year: 1991 } } },
+    { create: { _id: 2, data: { title: 'Beauty and the Beast 2', year: 2030 } } },
+    { create: { _id: 1, data: { title: 'Beauty and the Beast 3', year: 2031 } } }, // document already exists error
+    { create: { _id: 2, data: { title: 'Beauty and the Beast 4', year: 2049 } } }  // document already exists error
+  ]
+}).then((response) => {
+  response.body.forEach((item) => {
+    const createStatus = item.create && item.create.status;
+    if (createStatus && !createStatus.toString().match(/2\d{2}/)) {
+      console.log(item.create.error.reason);
+    }
+  });
+}).catch((error) => {
+  console.error(error);
+});
+```
+
+## Cleanup
+To clean up the resources created in this guide, delete the `movies` and `books` indices:
+
+```javascript
+client.indices.delete({ index: [movies, books] });
+```
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