Database
[{"title":"String","syllabus":{"currentChapter":{"heading":"String","topics":["String"],},"chapters":[{"heading":"String","topics":["String"],},],}},{"title":"Correct title","syllabus":{"currentChapter":{"heading":"String","topics":["String"],},"chapters":[{"heading":"H 1","topics":["String"],},],}}]
Query
db.collection.find({/** _id: id*/"syllabus.chapters":{"$elemMatch":{"heading":"H 1"}}})