Reindex fails due to SearchContextMissingException

Hello,
My company is using elasticsearch 2.3.4.
We have a cluster that contains 38 ES nodes, and we've been having a problem with reindexing some of our data lately...
We've reindexed before very large indexes and had no problems, but recently, when trying to reindex much smaller indexed (less than 10GB) - we get : "SearchContextMissingException [No search context found for id [XXX]]".
We have no idea what's causing this problem or how to fix it. We'd like some guidance.
Has anyone saw this exception before?

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