Fix/issue 638/updated point in time guide (#661)

* Updated point in time guide & CHANGELOG.

Signed-off-by: Djcarrillo6 <djcarrillo6@yahoo.com>

* Updated point in time guide.

Signed-off-by: Djcarrillo6 <djcarrillo6@yahoo.com>

CHAGELOG w/PR info.

Signed-off-by: Djcarrillo6 <djcarrillo6@yahoo.com>

---------

Signed-off-by: Djcarrillo6 <djcarrillo6@yahoo.com>

CHANGELOG.md

@@ -14,6 +14,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Incorporated API generation into CI workflow and fixed 'generate' nox session ([#660](https://github.com/opensearch-project/opensearch-py/pull/660))
 ### Changed
 - Updated the `get_policy` API in the index_management plugin to allow the policy_id argument as optional ([#633](https://github.com/opensearch-project/opensearch-py/pull/633))
+- Updated the `point_in_time.md` guide with examples demonstrating the usage of the new APIs as alternatives to the deprecated ones. ([#661](https://github.com/opensearch-project/opensearch-py/pull/661))
 ### Deprecated
 ### Removed
 - Removed unnecessary `# -*- coding: utf-8 -*-` headers from .py files ([#615](https://github.com/opensearch-project/opensearch-py/pull/615), [#617](https://github.com/opensearch-project/opensearch-py/pull/617))

guides/point_in_time.md

@@ -1,6 +1,7 @@
-- [Point-in-Time](#point-in-time)
+- [Point-in-Time - Deprecated Implementation Examples](#point-in-time---deprecated-implementation-examples)
+- [Point-in-Time - Updated Implementation Examples](#point-in-time---updated-implementation-examples)
 
-### Point-in-Time
+### Point-in-Time - Deprecated Implementation Examples
 
 [Point in Time (PIT)](https://opensearch.org/docs/latest/search-plugins/point-in-time/) lets you run different queries against a dataset that is fixed in time.
 
@@ -41,3 +42,43 @@ Delete all point in time.
 response = client.delete_point_in_time(body=None, all=True)
 print(response)
 ```
+
+
+### Point-in-Time - Updated Implementation Examples
+
+Create a point in time on an index.
+
+```python
+index_name = "test-index"
+response = client.create_pit(
+    index=index_name,
+    params={"keep_alive": "1m"}
+)
+
+pit_id = response.get("pit_id")
+print('\n Point in time ID:')
+print(pit_id)
+```
+
+
+List all point in time which are alive in the cluster.
+
+```python
+response = client.get_all_pits()
+print(response)
+```
+
+Delete a point in time.
+
+```python
+pit_body = {"pit_id": pit_id}
+response = client.delete_pit(body=pit_body)
+print(response)
+```
+
+Delete all point in time.
+
+```python
+response = client.delete_all_pits()
+print(response)
+```