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(DOCS-11033): Add limitation for 3.2 and earlier multikey indexes
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source/core/index-multikey.txt

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@@ -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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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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