Expand the overview section of the docs

Author: miguelgrinberg

docs/reference/index.md

@@ -11,6 +11,35 @@ This documentation covers the [official Python client for {{es}}](https://github
 
 API reference documentation is provided on [Read the Docs](https://elasticsearch-py.readthedocs.io).
 
+This client is composed of several modules:
+
+* The actual client, sometimes also called the "low-level" client
+
+ This module implements the client support for sending requests to {{es}} servers. The entire surface of the {{es}} API is available through this module.
+
+ * [Features](#_features)
+ * [Reference documentation](https://elasticsearch-py.readthedocs.io/en/stable/es_api.html)
+
+* Bulk helpers
+
+ The bulk helpers are a set of functions that use the low-level client's bulk ingest functions, but export a high-level interface based on Python iterables to simplify the ingest of large amounts of data.
+
+ * [User guide](https://www.elastic.co/docs/reference/elasticsearch/clients/python/client-helpers#bulk-helpers)
+ * [Reference documentation](https://elasticsearch-py.readthedocs.io/en/stable/api_helpers.html)
+
+* ES|QL query builder
+
+ This module offers an idiomatic interface to construct ES|QL queries based on Python expressions.
+
+ * [User guide](https://www.elastic.co/docs/reference/elasticsearch/clients/python/esql-query-builder)
+ * [Reference documentation](https://elasticsearch-py.readthedocs.io/en/stable/esql.html)
+
+* DSL module
+
+ The DSL module could be thought of as a high-level client for {{es}}. It allows applications to manipulate documents and queries using classes and objects instead of primitive types such as dictionaries and lists.
+
+ * [User guide](https://www.elastic.co/docs/reference/elasticsearch/clients/python/elasticsearch-dsl)
+ * [Reference documentation](https://elasticsearch-py.readthedocs.io/en/stable/dsl.html)
 
 The following example shows a simple Python client use case:
 
@@ -51,13 +80,17 @@ The client also provides a convenient set of [helpers](client-helpers.md) for ta
 To get started, try this walkthrough: [Ingest data with Python](docs-content://manage-data/ingest/ingesting-data-from-applications/ingest-data-with-python-on-elasticsearch-service.md)
 ::::
 
+<<<<<<< Updated upstream
 ### Elasticsearch Python DSL [_elasticsearch_python_dsl]
 
 The [Python DSL module](../reference/elasticsearch-dsl.md) offers a convenient and idiomatic way to write and manipulate queries. 
 
 ## {{es}} version compatibility [_compatibility]
 
 Language clients are **forward compatible**: each client version works with equivalent and later minor versions of the **same or next major** version of {{es}}. For full compatibility, the client and {{es}} minor versions should match.
+=======
+## Compatibility [_compatibility]
+>>>>>>> Stashed changes
 
 | Client version | {{es}} `8.x` | {{es}} `9.x` | {{es}} `10.x` |
 |----------------|---------------------------------|---------------------------------|----------------------------------|