The bad interaction of collation and Symbol described by SERVER-27195 can cause indexes to be in an inconsistent state. Until we have a complete fix in place, we should prevent insertion of Symbol data which would be indexed with a non-simple collation. This additional restriction will apply only to new v:2 indexes with a non-simple collation.
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SERVER-27195 Symbol BSON type compares incorrectly with String when the collation is non-simple
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