Added bulk samples and explained error handling.

guides/bulk.md

@@ -1,10 +1,15 @@
 - [Bulk Indexing](#bulk-indexing)
-  - [Use a Helper](#use-a-helper)
+  - [Line-Delimited JSON](#line-delimited-json)
+  - [Bulk Helper](#bulk-helper)
 
 # Bulk Indexing
 
 The [Bulk API](https://opensearch.org/docs/latest/api-reference/document-apis/bulk/) lets you add, update, or delete multiple documents in a single request.
 
+## Line-Delimited JSON
+
+The `bulk` API accepts line-delimited JSON. This method requires the caller to evaluate the return value and parse errors in the case of a failure or partial success. See [samples/bulk/bulk-ld.py](../samples/bulk/bulk-ld.py) for a working sample.
+
 ```python
 from opensearchpy import OpenSearch
 
@@ -20,27 +25,47 @@ docs = '''
 '''
 
 response = client.bulk(docs)
-print(response)
+if response["errors"]:
+    print(f"There were errors!")
+else:
+    print(f"Bulk-inserted {len(rc['items'])} items.")
 ```
 
-## Use a Helper
+The client can also serialize an array of data into bulk-delimited JSON for you. See [samples/bulk/bulk-array.py](../samples/bulk/bulk-array.py) for a working sample.
+
+```python
+data = [
+    { "index": { "_index": "index-2022-06-08", "_id": 1 }}
+    { "name": "foo"} 
+    { "index": { "_index": "index-2022-06-09", "_id": 2 }}
+    { "name": "bar"}
+    { "index": { "_index": "index-2022-06-10", "_id": 3 }}
+    { "name": "baz"}
+]
+
+response = client.bulk(data)
+if response["errors"]:
+    print(f"There were errors!")
+else:
+    print(f"Bulk-inserted {len(rc['items'])} items.")
+```
+
+## Bulk Helper
+
+A helper can generate the line-delimited JSON for you from a Python array that contains `_index` and `_id` fields, and parse errors. The `helpers.bulk` implementation will raise `BulkIndexError` if any error occurs. This may indicate a partially successful result. See [samples/bulk/bulk-helpers.py](../samples/bulk/bulk-helpers.py) for a working sample.
 
 ```python
 from opensearchpy import OpenSearch, helpers
 
 client = OpenSearch(...)
 
-docs = []
-def generate_data():
-    mywords = ['foo', 'bar', 'baz']
-    for index, word in enumerate(mywords):
-        docs.append({
-            "_index": "mywords",
-            "word": word,
-            "_id": index
-        })
-    return docs
-
-response = helpers.bulk(client, generate_data(), max_retries=3)
+docs = [
+    { "_index": "words", "_id": "word1", word: "foo" },
+    { "_index": "words", "_id": "word2", word: "bar" },
+    { "_index": "words", "_id": "word3", word: "baz" },
+]
+
+response = helpers.bulk(client, docs, max_retries=3)
 print(response)
 ```
+

samples/bulk/bulk-array.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+# 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.
+
+import os
+import json
+
+from opensearchpy import OpenSearch
+
+# connect to an instance of OpenSearch
+
+host = os.getenv('HOST', default='localhost')
+port = int(os.getenv('PORT', 9200))
+auth = (
+    os.getenv('USERNAME', 'admin'), 
+    os.getenv('PASSWORD', 'admin')
+)
+
+client = OpenSearch(
+    hosts = [{'host': host, 'port': port}],
+    http_auth = auth,
+    use_ssl = True,
+    verify_certs = False,
+    ssl_show_warn = False
+)
+
+# check whether an index exists
+index_name = "my-index"
+
+if not client.indices.exists(index_name):
+
+    client.indices.create(index_name, 
+        body={
+            "mappings":{
+                "properties": {
+                    "value": {
+                        "type": "float"
+                    },
+                }
+            }
+        }
+    )
+
+# index data
+data = []
+for i in range(100):
+    data.append({ "index": {"_index": index_name, "_id": i }})
+    data.append({ "value": i })
+
+rc = client.bulk(data)
+if rc["errors"]:
+    print(f"There were errors:")
+    for item in rc["items"]:
+        print(f"{item['index']['status']}: {item['index']['error']['type']}")
+else:
+    print(f"Bulk-inserted {len(rc['items'])} items.")
+
+# delete index
+client.indices.delete(index=index_name)
+

samples/bulk/bulk-helpers.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+
+# 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.
+
+import os
+import json
+
+from opensearchpy import OpenSearch, helpers
+
+# connect to an instance of OpenSearch
+
+host = os.getenv('HOST', default='localhost')
+port = int(os.getenv('PORT', 9200))
+auth = (
+    os.getenv('USERNAME', 'admin'), 
+    os.getenv('PASSWORD', 'admin')
+)
+
+client = OpenSearch(
+    hosts = [{'host': host, 'port': port}],
+    http_auth = auth,
+    use_ssl = True,
+    verify_certs = False,
+    ssl_show_warn = False
+)
+
+# check whether an index exists
+index_name = "my-index"
+
+if not client.indices.exists(index_name):
+
+    client.indices.create(index_name, 
+        body={
+            "mappings":{
+                "properties": {
+                    "value": {
+                        "type": "float"
+                    },
+                }
+            }
+        }
+    )
+
+# index data
+data = []
+for i in range(100):
+    data.append({ "_index": index_name, "_id": i, "value": i })
+
+rc = helpers.bulk(client, data)
+print(f"Bulk-inserted {rc[0]} items.")
+
+# delete index
+client.indices.delete(index=index_name)
+

samples/bulk/bulk-ld.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+# 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.
+
+import os
+import json
+
+from opensearchpy import OpenSearch
+
+# connect to an instance of OpenSearch
+
+host = os.getenv('HOST', default='localhost')
+port = int(os.getenv('PORT', 9200))
+auth = (
+    os.getenv('USERNAME', 'admin'), 
+    os.getenv('PASSWORD', 'admin')
+)
+
+client = OpenSearch(
+    hosts = [{'host': host, 'port': port}],
+    http_auth = auth,
+    use_ssl = True,
+    verify_certs = False,
+    ssl_show_warn = False
+)
+
+# check whether an index exists
+index_name = "my-index"
+
+if not client.indices.exists(index_name):
+
+    client.indices.create(index_name, 
+        body={
+            "mappings":{
+                "properties": {
+                    "value": {
+                        "type": "float"
+                    },
+                }
+            }
+        }
+    )
+
+# index data
+data = ''
+for i in range(100):
+    data += json.dumps({ "index": {"_index": index_name, "_id": i }}) + "\n"
+    data += json.dumps({ "value": i }) + "\n"
+
+rc = client.bulk(data)
+if rc["errors"]:
+    print(f"There were errors:")
+    for item in rc["items"]:
+        print(f"{item['index']['status']}: {item['index']['error']['type']}")
+else:
+    print(f"Bulk-inserted {len(rc['items'])} items.")
+
+# delete index
+client.indices.delete(index=index_name)
+