bson/src/main/org/bson/AbstractBsonWriter.java
protected void pipeExtraElements(final List<BsonElement> extraElements) {
        notNull("extraElements", extraElements);
        for (BsonElement cur : extraElements) {
            writeName(cur.getName());
            pipeValue(cur.getValue());
        }
    }
protected void pipeExtraElements(final List<BsonElement> extraElements) {
        notNull("extraElements", extraElements);
        for (BsonElement cur : extraElements) {
            writeName(cur.getName());
            pipeValue(cur.getValue());
        }
    }
Pipe a list of extra element to this writer

@param extraElements the extra elements