[{"_id":"100","menu":[{"type":"1","isenabled":true,"items":[{"key":"activity","enabled":true,"criteria":[{"key":"account","value":["active"],"isExclude":false}],"eligible":["QA","DE"],"isItem":false}]}]}]

db.collection.update({},{$push:{"menu.$[m].items.$[i].eligible":"US"}},{arrayFilters:[{"m.type":"1"},{"i.eligible":["QA","DE"]}],multi:true})