An example find() command on a DB with 10m documents but no index explained

db.collections.find() - no Index

//mongo sh
db.descriptions.find( {productId: {$gt : 9999990 } } ).explain("executionStats")
{
	"queryPlanner" : {
		"plannerVersion" : 1,
		"namespace" : "trailblazer.descriptions",
		"indexFilterSet" : false,
		"parsedQuery" : {
			"productId" : {
				"$gt" : 9999990
			}
		},
...
	"executionStats" : {
		"executionSuccess" : true,
		"nReturned" : 10,
		"executionTimeMillis" : 15312,
		"totalKeysExamined" : 0,
		"totalDocsExamined" : 10452305,
...
}