Apply match

https://docs.mongodb.com/manual/reference/operator/aggregation/match/

Filters the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

{ $match: { <query> } }

Property definitions

mongodb $ MongoPipeline :: match
	# Apply match
	#
	# https://docs.mongodb.com/manual/reference/operator/aggregation/match/
	#
	# Filters the documents to pass only the documents that match the specified
	# condition(s) to the next pipeline stage.
	#
	# ~~~json
	# { $match: { <query> } }
	# ~~~
	fun match(query: MongoMatch): MongoPipeline do return add_stage("match", query)
lib/mongodb/queries.nit:408,2--418,80