Sparse index utilisation without $exists

Question

https://docs.aws.amazon.com/documentdb/latest/developerguide/functional-differences.html#functional-differences.sparse-index is causing me problems migrating an existing MongoDB code-base that makes use of sparse indexes - some of the queries are now unindexed and therefore take minutes/hours rather than milliseconds.  
  
Is there a plan to fix this compatibility bug any time soon, or do I need to track down every query that relies on a sparse index and fix it?  
  
Thanks,  
Tom

Answer

For now, the recommended action is to track the slow queries by enabling Profiling and update the queries to include $exists.

Sparse index utilisation without $exists

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