[{"data":{"category":[{"name":"HELLO","subcategory":["EDUCATION","ART"]},{"name":"HELLO","subcategory":["z","SHORE",]},{"name":"HELLO","subcategory":["EDUCATION","ART"]}]}},{"data":{"category":[{"name":"HELLO","subcategory":["EDUCATION","HELLO",]}]}},{"data":{"category":[{"name":"HELLO","subcategory":["GG","ART",]}]}}]

db.collection.update({},{"$push":{"data.category.$[elem].subcategory":{"$each":["X","Y"]}}},{multi:true,arrayFilters:[{"elem.subcategory":"EDUCATION"}]})