On a mongod with the following parameters set: mongod --setParameter enableTestCommands=true --setParameter featureFlagCommonQueryFramework=true --setParameter internalQueryFrameworkControl=tryBonsai Run the following:   db.coll.createIndex({a: 1}); db.coll.insertMany([{a: 1}, {a: 2}, {a: 2}, {a: 3}, {a: 3}, {a: 3}]); db.runCommand({analyze: "coll", key: "a"});     At this point, the stats collection should be initialized correctly. Now run the following to force HistogramCE to be used:   db.adminCommand({setParameter: 1, internalQueryCardinalityEstimatorMode: "histogram"}) db.adminCommand({setParameter: 1, internalQueryFrameworkControl: "forceBonsai"})     This results in the following command failing: db.coll.aggregate({$match: {a: 1}}); > Error: error: { "ok" : 0, "errmsg" : "Error getting histograms for path test.test : aBSON field 'StatsPath.statistics.documents' is the wrong type 'int', expected type 'long'", "code" : 14, "codeName" : "TypeMismatch" }