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Explain output for find commands include a serverInfo object that contains version information:

> db.foo.explain().find().finish().serverInfo

	"host" : "MacBook-Pro.local",

	"port" : 27017,

	"version" : "4.1.4",

	"gitVersion" : "2f4b5918497b09a226a3ec5dcff930edd52ea1e9"

However, this information is not available for aggregation commands:

> db.foo.explain().aggregate([])

	"stages" : [

			"$cursor" : {

				"query" : {

},

				"queryPlanner" : {

					"plannerVersion" : 1,

					"namespace" : "test.foo",

					"indexFilterSet" : false,

					"parsedQuery" : {

},

					"queryHash" : "8B3D4AB8",

					"winningPlan" : {

						"stage" : "COLLSCAN",

						"direction" : "forward"

},

					"rejectedPlans" : [ ]

],

	"ok" : 1

This would be helpful to include for more complete information when troubleshooting .

is documented by

DOCS-13197 Investigate changes in SERVER-38691: serverInfo not present in explain output for aggregation