Why update or create operation could be failed?

Hi, long story short: I need to implement a kind of rollback feature and I'm interested in what reasons could be which causes update/create operations failure. I'm using Elasticsearch with Python. When the update operation executions ends-up it returns a list of dictionaries with values of doc id, operation type and status. So, what could happen to cause the status be failed. If there is a conflict than an appropriate exception will be raised.

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