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(DOCS-11033): Add limitation for 3.2 and earlier multikey indexes #4766

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Jan 11, 2021
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(DOCS-11033): Add limitation for 3.2 and earlier multikey indexes #4766

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14 changes: 14 additions & 0 deletions source/core/index-multikey.txt
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Expand Up @@ -210,6 +210,20 @@ $expr

:query:`$expr` does not support multikey indexes.

Indexes Built on MongoDB 3.2 or Earlier
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Indexes built on MongoDB 3.2 or earlier do not contain the necessary
flags to support optimized multikey index use. To benefit from the
performance enhancements of multikey indexes, you must either:

- Rebuild the older-format indexes on MongoDB 3.4 or later. See
:method:`db.collection.reIndex()`.

- On a replica set, :doc:`resync the replica set members
</tutorial/resync-replica-set-member/>` containing older-format
indexes.

Examples
--------

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