$literal This returns a value without parsing. It is used for values that the aggregation pipeline may interpret as an expression. For example, apply a $literal expression to a string that starts with $ to avoid parsing as a field path.
$literal This returns a value without parsing. It is used for values that the aggregation pipeline may interpret as an expression. For example, apply a $literal expression to a string that starts with $ to avoid parsing as a field path.
3.147.27.131