Create collection db.students2.insertMany([{ "_id" : 1, "grades" : [ { "grade" : 80, "mean" : 75, "std" : 6 }, { "grade" : 85, "mean" : 90, "std" : 4 }, { "grade" : 85, "mean" : 85, "std" : 6 } ] }, { "_id" : 2, "grades" : [ { "grade" : 90, "mean" : 75, "std" : 6 }, { "grade" : 87, "mean" : 90, "std" : 3 }, { "grade" : 85, "mean" : 85, "std" : 4 } ] }])     Execute query for Robo 3T  db.students2.update( { }, { $set: { "grades.$[elem].mean" : 100 } }, { multi: true , arrayFilters: [ { "elem.grade" : { $gte: 85 } } ] } )   Result No array filter found for identifier 'elem' in path 'grades.$[elem].mean' Save same query to file students2.js and execute in terminal shell mongo test students2.js Result MongoDB shell version v3.6.9 connecting to: mongodb://127.0.0.1:27017/test Implicit session: session { "id" : UUID("ca4a94a6-75ce-45d0-a3d8-38c5b2a4aaa4") } and only after shell executing db.getCollection('students2').find({}) gives   /* 1 */ { "_id" : 1.0, "grades" : [ { "grade" : 80.0, "mean" : 75.0, "std" : 6.0 }, { "grade" : 85.0, "mean" : 100.0, "std" : 4.0 }, { "grade" : 85.0, "mean" : 100.0, "std" : 6.0 } ] } /* 2 */ { "_id" : 2.0, "grades" : [ { "grade" : 90.0, "mean" : 100.0, "std" : 6.0 }, { "grade" : 87.0, "mean" : 100.0, "std" : 3.0 }, { "grade" : 85.0, "mean" : 100.0, "std" : 4.0 } ] }