Is it possible to match fullDocument and fullDocumentBeforeChange against a $text constraint in the aggregation pipeline of a change stream definition (collection.watch)?

I guess part of the answer lies in this bit: “Change streams cannot use indexes. MongoDB does not support creating indexes on the oplog collection.”, but I’d like to have a clearer answer: yes you cannot create indexes on the oplog, yes change streams supposedly are just a view of the oplog, but still, one could implement $text queries on individual change stream events fullDocument. Looks like a no to me, but please confirm.