$elemMatch
The `$elemMatch` operator matches documents that contain an array field with at least one element that matches all the specified query criteria.
Syntax
{ field: { $elemMatch: { <query1>, <query2>, ... } } }
Parameters
field
stringrequiredThe field to query.
<query1>, <query2>
stringrequiredOne or more query expressions that must all match at least one array element.