Concurrency issue in elastic search

[mfeurer]

Elastic search sometimes fails stochastically with the error:

{"error":{"root_cause":[{"type":"version_conflict_engine_exception","reason":"[data][125]: version conflict, required seqNo [108522], primary term [1]. current document has seqNo [108523] and primary term [1]","index_uuid":"d_zNAG--SW-U97P61jOrSg","shard":"0","index":"data"}],"type":"version_conflict_engine_exception","reason":"[data][125]: version conflict, required seqNo [108522], primary term [1]. current document has seqNo [108523] and primary term [1]","index_uuid":"d_zNAG--SW-U97P61jOrSg","shard":"0","index":"data"},"status":409}

on calling https://test.openml.org/api/v1/xml/data/untag

According to @joaquinvanschoren this is due to https://stackoverflow.com/questions/64034453/elastic-search-version-conflict-issue