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Adding bulk request example in user guide (opensearch-project#373)
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Signed-off-by: Vacha Shah <vachshah@amazon.com>
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VachaShah authored Feb 28, 2023
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- [Index data](#index-data)
- [Search for the documents](#search-for-the-documents)
- [Search documents using a match query](#search-documents-using-a-match-query)
- [Bulk requests](#bulk-requests)
- [Aggregations](#aggregations)
- [Delete the document](#delete-the-document)
- [Delete the index](#delete-the-index)
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}
```

## Bulk requests

```java
ArrayList<BulkOperation> ops = new ArrayList<>();
SimplePojo doc1 = new SimplePojo("Document 1", "The text of document 1");
ops.add(new BulkOperation.Builder().index(
IndexOperation.of(io -> io.index(TEST_INDEX).id("id1").document(doc1))
).build());
SimplePojo doc2 = new SimplePojo("Document 2", "The text of document 2");
ops.add(new BulkOperation.Builder().index(
IndexOperation.of(io -> io.index(TEST_INDEX).id("id2").document(doc2))
).build());
SimplePojo doc3 = getLongDoc("Long Document 3", 100000);
ops.add(new BulkOperation.Builder().index(
IndexOperation.of(io -> io.index(TEST_INDEX).id("id3").document(doc3))
).build());

BulkRequest.Builder bulkReq = new BulkRequest.Builder()
.index(index)
.operations(ops)
.refresh(Refresh.WaitFor);
BulkResponse bulkResponse = client.bulk(bulkReq.build());
```

## Aggregations

```java
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