Reorganization of the Sphinx docs to only include reference pages (#2776)

* add DSL module reference documentation to sphinx docs

* only reference docs

* renamed pages to avoid collisions with redirects

(cherry picked from commit a1b458e)

Author: miguelgrinberg

docs/sphinx/api_helpers.rst

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+.. _helpers:
+
+Helpers
+=======
+
+.. py:module:: elasticsearch.helpers
+
+Streaming Bulk
+--------------
+.. autofunction:: streaming_bulk
+
+Parallel Bulk
+-------------
+.. autofunction:: parallel_bulk
+
+Bulk
+----
+.. autofunction:: bulk
+
+Scan
+----
+.. autofunction:: scan
+
+Reindex
+-------
+.. autofunction:: reindex

docs/sphinx/async.rst

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+Async Helpers
+=============
+
+Async variants of all helpers are available in ``elasticsearch.helpers``
+and are all prefixed with ``async_*``. You'll notice that these APIs
+are identical to the ones in the sync :ref:`helpers` documentation.
+
+All async helpers that accept an iterator or generator also accept async iterators
+and async generators.
+
+ .. py:module:: elasticsearch.helpers
+    :no-index:
+
+Streaming Bulk
+--------------
+ .. autofunction:: async_streaming_bulk
+
+Bulk
+----
+ .. autofunction:: async_bulk
+
+Scan
+----
+ .. autofunction:: async_scan
+
+Reindex
+-------
+ .. autofunction:: async_reindex
+

docs/sphinx/async_api_helpers.rst

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+.. _async_dsl:
+
+Async DSL
+=========
+
+.. py:module:: elasticsearch.dsl
+   :no-index:
+
+Search
+------
+.. autoclass:: AsyncSearch
+   :inherited-members:
+   :members:
+
+Multi-Search
+------------
+.. autoclass:: AsyncMultiSearch
+   :inherited-members:
+   :members:
+
+Document
+--------
+.. autoclass:: AsyncDocument
+   :inherited-members:
+   :members:
+
+Index
+-----
+.. autoclass:: AsyncIndex
+   :inherited-members:
+   :members:
+
+Mapping
+-------
+.. autoclass:: AsyncMapping
+   :inherited-members:
+   :members:
+
+Faceted Search
+--------------
+.. autoclass:: AsyncFacetedSearch
+   :inherited-members:
+   :members:
+
+Update by Query
+---------------
+.. autoclass:: AsyncUpdateByQuery
+   :inherited-members:
+   :members:

docs/sphinx/async_dsl.rst

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+Async Elasticsearch API
+=======================
+
+ .. py:module:: elasticsearch
+    :no-index:
+
+ .. note::
+
+    To reference Elasticsearch APIs that are namespaced like ``.indices.create()``
+    refer to the sync API reference. These APIs are identical between sync and async.
+
+Elasticsearch
+-------------
+ .. autoclass:: AsyncElasticsearch
+   :members: