[DOCS] Adds quickstart guide to ES Py Read The Docs (#2335)

Co-authored-by: Quentin Pradet <[email protected]>

docs/sphinx/index.rst

@@ -110,6 +110,7 @@ Contents
 .. toctree::
    :maxdepth: 3
 
+   quickstart
    api
    exceptions
    async

docs/sphinx/quickstart.rst

@@ -0,0 +1,129 @@
+Quickstart 
+==========
+
+This guide shows you how to install the Elasticsearch Python client and perform basic
+operations like indexing or searching documents.
+
+Requirements
+------------
+
+- `Python <https://www.python.org/>`_ 3.6 or newer
+- `pip <https://pip.pypa.io/en/stable/>`_
+
+
+Installation
+------------
+
+To install the client, run the following command:
+
+.. code-block:: console
+
+    $ python -m pip install elasticsearch
+
+
+Connecting
+----------
+
+You can connect to Elastic Cloud using an API key and the Cloud ID.
+
+.. code-block:: python
+
+    from elasticsearch import Elasticsearch
+
+    client = Elasticsearch(cloud_id="YOUR_CLOUD_ID", api_key="YOUR_API_KEY")
+
+Your Cloud ID can be found on the **My deployment** page of your deployment 
+under **Cloud ID**.
+
+You can generate an API key on the **Management** page under Security.
+
+.. image:: ../guide/images/create-api-key.png
+
+
+Using the client
+----------------
+
+Time to use Elasticsearch! This section walks you through the most important 
+operations of Elasticsearch. The following examples assume that the Python 
+client was instantiated as above.
+
+
+Creating an index
+^^^^^^^^^^^^^^^^^
+
+This is how you create the `my_index` index:
+
+.. code-block:: python
+
+    client.indices.create(index="my_index")
+
+
+Indexing documents
+^^^^^^^^^^^^^^^^^^
+
+This indexes a document with the index API:
+
+.. code-block:: python
+
+    client.index(
+        index="my_index",
+        id="my_document_id",
+        document={
+            "foo": "foo",
+            "bar": "bar",
+        },
+    )
+
+
+Getting documents
+^^^^^^^^^^^^^^^^^
+
+You can get documents by using the following code:
+
+.. code-block:: python
+    
+    client.get(index="my_index", id="my_document_id")
+
+
+Searching documents
+^^^^^^^^^^^^^^^^^^^
+
+This is how you can create a single match query with the Python client: 
+
+
+.. code-block:: python
+
+    client.search(index="my_index", query={"match": {"foo": {"query": "foo"}}})
+
+
+Updating documents
+^^^^^^^^^^^^^^^^^^
+
+This is how you can update a document, for example to add a new field:
+
+.. code-block:: python
+
+    client.update(
+        index="my_index",
+        id="my_document_id",
+        doc={
+            "foo": "bar",
+            "new_field": "new value",
+        },
+    )
+
+
+Deleting documents
+^^^^^^^^^^^^^^^^^^
+
+.. code-block:: python
+    
+    client.delete(index="my_index", id="my_document_id")
+
+
+Deleting an index
+^^^^^^^^^^^^^^^^^
+
+.. code-block:: python
+    
+    client.indices.delete(index="my_index")