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1 parent da29b28 commit 98de4c4Copy full SHA for 98de4c4
source/core/index-multikey.txt
@@ -210,6 +210,20 @@ $expr
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:query:`$expr` does not support multikey indexes.
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+Indexes Built on MongoDB 3.2 or Earlier
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+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
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+Indexes built on MongoDB 3.2 or earlier do not contain the necessary
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+flags to support optimized multikey index use. To benefit from the
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+performance enhancements of multikey indexes, you must either:
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+- Rebuild the older-format indexes on MongoDB 3.4 or later. See
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+ :method:`db.collection.reIndex()`.
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+- On a replica set, :doc:`resync the replica set members
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+ </tutorial/resync-replica-set-member/>` containing older-format
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+ indexes.
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Examples
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--------
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