driver-core/src/main/com/mongodb/ReadConcern.java
public BsonDocument asDocument() {
        BsonDocument readConcern = new BsonDocument();
        if (level != null) {
            readConcern.put("level", new BsonString(level.getValue()));
        }
        return readConcern;
    }
public BsonDocument asDocument() {
        BsonDocument readConcern = new BsonDocument();
        if (level != null) {
            readConcern.put("level", new BsonString(level.getValue()));
        }
        return readConcern;
    }
Gets this read concern as a document.

@return The read concern as a BsonDocument