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QO 2022-07-11, QO 2022-07-25, QO 2022-08-08, QO 2022-08-22, QO 2022-09-05, QO 2022-09-19
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Similarly to ~~SERVER-31760~~ it's possible to rewrite $expr with $gt/$lt expression to an indexable MatchExpression.

I believe the two clear cases of this are:

bounded on both ends comparison to same type, i.e. {$and:[{$gte:["$x",0]}, {$lt:["$x",100]}]} can be rewritten to {x:{$gte:0, $lt:100}
comparison to type and'ed with $type comparison to same type, i.e. {$and:[{$lt:["$sys_created_on",ISODate("2012-02-28T03:04:49Z")]},{$eq:\\{$type:"$sys_created_on"},"date"}]}

I think the first case would be more common in "normal use" the second can be used to force the type bracketing semantics in aggregation comparisons.

duplicates

SERVER-69680 allow $expr with comparison bounded by value and $type to use a non-multikey index

SERVER-39943 Create match expressions for aggregation $gt/$gte/$lt/$lte and add to $expr rewrite

is duplicated by

SERVER-40636 $expr inside $match does not use indexes in many cases

is related to

SERVER-34687 Aggregation Index Performance

related to

SERVER-39938 aggregation $match before $lookup optimization doesn't happen when $expr: $eq is used

SERVER-39943 Create match expressions for aggregation $gt/$gte/$lt/$lte and add to $expr rewrite

(1 related to)