db.coll.insert({"a": [{"b": 0, c: [{"d": 0}, {"d": 1}]}, {"b": 1, "c": [{"d": 0}, {"d": 1}]}]})
db.coll.update({}, {$set: {"a.$[i].c.$[j].d": 2}}, {arrayFilters: [{"i.b": {$eq: 0} }, {"j.d": {$eq: 0}}]})
db.coll.update({}, {$set: {"a.$[].c.$[j].d": 3}}, {arrayFilters: [{"j.d": {$eq: 0}}]})

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })


db.coll.insert({"a": [{"b": "0", c: [{"d": "0"}, {"d": "1"}]}, {"b": "1", "c": [{"d": "0"}, {"d": "1"}]}]})
db.coll.update({}, {$set: {"a.$[].c.$[j].d": 3}}, {arrayFilters: [{"j.d": {$eq: 0}}]})

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 0 })