Added a guide on making raw JSON REST requests.

Signed-off-by: dblock <dblock@amazon.com>

CHANGELOG.md

@@ -5,9 +5,10 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Added
 - Added generating imports and headers to API generator ([#467](https://github.com/opensearch-project/opensearch-py/pull/467))
 - Added point-in-time APIs (create_pit, delete_pit, delete_all_pits, get_all_pits) and Security Client APIs (health and update_audit_configuration) ([#502](https://github.com/opensearch-project/opensearch-py/pull/502))
-- Added new guide for using index templates with the client ([#531](https://github.com/opensearch-project/opensearch-py/pull/531))
+- Added guide on using index templates ([#531](https://github.com/opensearch-project/opensearch-py/pull/531))
 - Added `pool_maxsize` for `Urllib3HttpConnection` ([#535](https://github.com/opensearch-project/opensearch-py/pull/535))
 - Added benchmarks ([#537](https://github.com/opensearch-project/opensearch-py/pull/537))
+- Added guide on making raw JSON REST requests ([#542](https://github.com/opensearch-project/opensearch-py/pull/542))
 ### Changed
 - Generate `tasks` client from API specs ([#508](https://github.com/opensearch-project/opensearch-py/pull/508))
 - Generate `ingest` client from API specs ([#513](https://github.com/opensearch-project/opensearch-py/pull/513))

USER_GUIDE.md

@@ -155,6 +155,7 @@ print(response)
 - [Using a Proxy](guides/proxy.md)
 - [Index Templates](guides/index_template.md)
 - [Advanced Index Actions](guides/advanced_index_actions.md)
+- [Making Raw JSON REST Requests](guides/json.md)
 - [Connection Classes](guides/connection_classes.md)
 
 ## Plugins

guides/json.md

@@ -0,0 +1,66 @@
+- [Making Raw JSON REST Requests](#making-raw-json-rest-requests)
+  - [GET](#get)
+  - [PUT](#put)
+  - [POST](#post)
+  - [DELETE](#delete)
+
+# Making Raw JSON REST Requests
+
+The OpenSearch client implements many high-level REST DSLs that invoke OpenSearch APIs. However you may find yourself in a situation that requires you to invoke an API that is not supported by the client. Use `client.transport.perform_request` to do so. See [samples/json](../samples/json) for a complete working sample.
+
+## GET
+
+The following example returns the server version information via `GET /`.
+
+```python
+info = client.transport.perform_request('GET', '/')
+print(f"Welcome to {info['version']['distribution']} {info['version']['number']}!")
+```
+
+Note that the client will parse the response as JSON when appropriate.
+
+## PUT
+
+The following example creates an index.
+
+```python
+index_body = {
+  'settings': {
+    'index': {
+      'number_of_shards': 4
+    }
+  }
+}
+
+client.transport.perform_request("PUT", "/movies", body=index_body)
+```
+
+Note that the client will raise errors automatically. For example, if the index already exists, an `opensearchpy.exceptions.RequestError: RequestError(400, 'resource_already_exists_exception',` will be thrown.
+
+## POST
+
+The following example searches for a document.
+
+```python
+q = 'miller'
+
+query = {
+  'size': 5,
+  'query': {
+    'multi_match': {
+      'query': q,
+      'fields': ['title^2', 'director']
+    }
+  }
+}
+
+client.transport.perform_request("POST", "/movies/_search", body = query)
+```
+
+## DELETE
+
+The following example deletes an index.
+
+```python
+client.transport.perform_request("DELETE", "/movies")
+```

samples/json/hello-async.py

@@ -0,0 +1,90 @@
+#!/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 asyncio
+
+from opensearchpy import AsyncOpenSearch
+
+async def main():
+    # connect to OpenSearch
+    host = 'localhost'
+    port = 9200
+    auth = ('admin', 'admin') # For testing only. Don't store credentials in code.
+
+    client = AsyncOpenSearch(
+        hosts = [{'host': host, 'port': port}],
+        http_auth = auth,
+        use_ssl = True,
+        verify_certs = False,
+        ssl_show_warn = False
+    )
+
+    try:
+      info = await client.transport.perform_request('GET', '/')
+      print(f"Welcome to {info['version']['distribution']} {info['version']['number']}!")
+
+      # create an index
+
+      index_name = 'movies'
+
+      index_body = {
+        'settings': {
+          'index': {
+            'number_of_shards': 4
+          }
+        }
+      }
+
+      print(await client.transport.perform_request("PUT", f"/{index_name}", body=index_body))
+
+      # add a document to the index
+
+      document = {
+        'title': 'Moneyball',
+        'director': 'Bennett Miller',
+        'year': '2011'
+      }
+
+      id = '1'
+
+      print(await client.transport.perform_request("PUT", f"/{index_name}/_doc/{id}?refresh=true", body = document))
+
+      # search for a document
+
+      q = 'miller'
+
+      query = {
+        'size': 5,
+        'query': {
+          'multi_match': {
+            'query': q,
+            'fields': ['title^2', 'director']
+          }
+        }
+      }
+
+      print(await client.transport.perform_request("POST", f"/{index_name}/_search", body = query))
+
+      # delete the document
+
+      print(await client.transport.perform_request("DELETE", f"/{index_name}/_doc/{id}"))
+
+      # delete the index
+
+      print(await client.transport.perform_request("DELETE", f"/{index_name}"))
+
+
+    finally: 
+      await client.close()
+
+if __name__ == "__main__":
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+    loop.run_until_complete(main())
+    loop.close()
+

samples/json/hello.py

@@ -0,0 +1,76 @@
+#!/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.
+
+from opensearchpy import OpenSearch
+
+# connect to OpenSearch
+
+host = 'localhost'
+port = 9200
+auth = ('admin', 'admin') # For testing only. Don't store credentials in code.
+
+client = OpenSearch(
+    hosts = [{'host': host, 'port': port}],
+    http_auth = auth,
+    use_ssl = True,
+    verify_certs = False,
+    ssl_show_warn = False
+)
+
+info = client.transport.perform_request('GET', '/')
+print(f"Welcome to {info['version']['distribution']} {info['version']['number']}!")
+
+# create an index
+
+index_name = 'movies'
+
+index_body = {
+  'settings': {
+    'index': {
+      'number_of_shards': 4
+    }
+  }
+}
+
+print(client.transport.perform_request("PUT", f"/{index_name}", body=index_body))
+
+# add a document to the index
+
+document = {
+  'title': 'Moneyball',
+  'director': 'Bennett Miller',
+  'year': '2011'
+}
+
+id = '1'
+
+print(client.transport.perform_request("PUT", f"/{index_name}/_doc/{id}?refresh=true", body = document))
+
+# search for a document
+
+q = 'miller'
+
+query = {
+  'size': 5,
+  'query': {
+    'multi_match': {
+      'query': q,
+      'fields': ['title^2', 'director']
+    }
+  }
+}
+
+print(client.transport.perform_request("POST", f"/{index_name}/_search", body = query))
+
+# delete the document
+
+print(client.transport.perform_request("DELETE", f"/{index_name}/_doc/{id}"))
+
+# delete the index
+
+print(client.transport.perform_request("DELETE", f"/{index_name}"))