Revert "DOCSP-15476 secondary indexes on time series metrics (#253)" (#917)

This reverts commit 9318da7.

Co-authored-by: jason-price-mongodb <[email protected]>

Author: jason-price-mongodb

source/core/timeseries-collections.txt

@@ -130,8 +130,6 @@ Other options allowed with the ``timeseries`` option are:
 
    :method:`db.createCollection()` and :dbcommand:`create`.
 
-.. _timeseries-collections-insert:
-
 Insert Measurements into a Time Series Collection
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

source/core/timeseries/timeseries-limitations.txt

@@ -1,8 +1,8 @@
 .. _manual-timeseries-collection-limitations:
 
-============================================
-Time Series Collection Notes and Limitations
-============================================
+==================================
+Time Series Collection Limitations
+==================================
 
 .. default-domain:: mongodb
 
@@ -102,12 +102,9 @@ types:
 
 Secondary indexes don't support the following index properties:
 
-- :doc:`2d </core/2d>` in MongoDB 5.2 and lower
-- :doc:`2dsphere </core/2dsphere>` in MongoDB 5.2 and lower
 - :doc:`TTL </core/index-ttl>`
 - :doc:`Unique </core/index-unique>`
-- :doc:`Partial </core/index-partial>` in MongoDB 5.2 and lower
-- :doc:`Multikey index </core/index-multikey>` on a measurement field
+- :doc:`Partial </core/index-partial>`
 
 Capped Collections
 ~~~~~~~~~~~~~~~~~~

source/includes/geoNear-time-series.rst

@@ -199,18 +199,13 @@ When using :pipeline:`$geoNear`, consider that:
 
 - .. include:: /includes/extracts/views-unsupported-geoNear.rst
 
-- Starting in MongoDB 4.2, :pipeline:`$geoNear` no longer has a default
+- Starting in version 4.2, :pipeline:`$geoNear` no longer has a default
   limit of 100 documents.
 
 - Starting in MongoDB 5.1, the ``near`` parameter supports the 
   :ref:`let option <geoNear_let_example>` and
   :ref:`bound let option <geoNear_bounded_let_example>`.
 
-- Starting in MongoDB 5.3, you can use the :pipeline:`$geoNear` pipeline
-  operator with a:
-
-  .. include:: /includes/geoNear-time-series.rst
-
 Examples
 --------
 

source/reference/operator/aggregation/geoNear.txt

@@ -16,15 +16,6 @@ This page is a work in progress and will be updated with changes
 introduced in 5.3 that can affect compatibility with older versions of
 MongoDB.
 
-Time Series Collections
------------------------
-
-If there are :term:`secondary indexes <secondary index>` on :ref:`time
-series collections <manual-timeseries-collection>` and you need to
-downgrade the Feature Compatibility Version (FCV), you must first drop
-any secondary indexes that are incompatible with the downgraded FCV.
-See :ref:`timeseries-limitations-secondary-indexes`.
-
 2dsphere Document Index Keys
 ----------------------------