[quote="Dom_Sie, post:1, topic:83154"]
Sometimes the Reindex process throws "SearchContextMissingExceptions" - if it can not resolve an Scroll-ID ; or sometimes a data-store leaves temporarily the cluster and there comes a "node_not_connected_exception".
There isn't really anything reindex can do about this. The scrolls aren't resumable on another node. It is probably worth figuring out why this happens in your cluster and fixing it. But you should be able to work around it by chunking the reindex processes by filtering on some field in your documents. Like time or some keyword field or something.