void DocumentSourceLookUp::doDispose() {
    if (_pipeline) {
        _usedDisk = _usedDisk || _pipeline->usedDisk();
        _pipeline->dispose(pExpCtx->opCtx);
        _pipeline.reset();
    }
}
void DocumentSourceLookUp::doDispose() {
    if (_pipeline) {
        _usedDisk = _usedDisk || _pipeline->usedDisk();
        _pipeline->dispose(pExpCtx->opCtx);
        _pipeline.reset();
    }
}