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TooManyOpenFiles might cause data-loss in ElasticSearch (Lucene) #2812

@s1monw

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@s1monw

Under certain circumstances a TooManyOpenFiles exception (in Java thrown as FileNotFoundException) might cause data loss where entire shards (lucene indices) are deleted. This is mainly caused by Lucene-4870 - currently all Elasticsearch releases are affected by this.

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