Error on /splits endpoint due to Mongo memory
Error in the logs while accessing https://datasets-server.huggingface.co/splits?dataset=universal_dependencies

```
pymongo.errors.OperationFailure: error while multiplanner was selecting best plan :: caused by :: Sort exceeded memory limit of 104857600 bytes, but did not opt in to external sorting., full error: {'ok': 0.0, 'errmsg': 'error while multiplanner was selecting best plan :: caused by :: Sort exceeded memory limit of 104857600 bytes, but did not opt in to external sorting.', 'code': 292, 'codeName': 'QueryExceededMemoryLimitNoDiskUseAllowed', '$clusterTime': {'clusterTime': Timestamp(1658129785, 1), 'signature': {'hash': b'="1\x9b\x8cw5{mE\xb1L#\xb6\x83iE\xc7ju', 'keyId': 7077944093346627589}}, 'operationTime': Timestamp(1658129785, 1)}
```

See https://github.com/huggingface/datasets/issues/4596
Error on /splits endpoint due to Mongo memory: Error in the logs while accessing https://datasets-server.huggingface.co/splits?dataset=universal_dependencies

```
pymongo.errors.OperationFailure: error while multiplanner was selecting best plan :: caused by :: Sort exceeded memory limit of 104857600 bytes, but did not opt in to external sorting., full error: {'ok': 0.0, 'errmsg': 'error while multiplanner was selecting best plan :: caused by :: Sort exceeded memory limit of 104857600 bytes, but did not opt in to external sorting.', 'code': 292, 'codeName': 'QueryExceededMemoryLimitNoDiskUseAllowed', '$clusterTime': {'clusterTime': Timestamp(1658129785, 1), 'signature': {'hash': b'="1\x9b\x8cw5{mE\xb1L#\xb6\x83iE\xc7ju', 'keyId': 7077944093346627589}}, 'operationTime': Timestamp(1658129785, 1)}
```

See https://github.com/huggingface/datasets/issues/4596