Elasticsearch error: "REGEX matching of entries in '/proc/self/cgroup'"

This article addresses a known bug in Elasticsearch versions 5.2.1 and below.

Elasticsearch version 5.2.1 and below are incompatible with Docker on the newer kernel provided in Ubuntu 18.04 which we are currently upgrading our Docker fleet's host machines to at the time.

We would highly recommend moving to a newer Elasticsearch version. 5.2.2+ should work properly with modern kernels. 

If you must test ES 5.2.1 or below, you may still use our machine executor for the time being. 

Official GitHub issue: https://github.com/elastic/elasticsearch/issues/23218

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