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Ours: https://docs.openshift.com/enterprise/latest/install_config/aggregate_logging.html Amount of RAM to reserve per Elasticsearch instance. The default is 8GB, and it must be at least 512MB. Upstream: https://github.com/openshift/origin-aggregated-logging/tree/master/deployment ES_INSTANCE_RAM: Amount of RAM to reserve per ElasticSearch instance (e.g. 1024M, 2G). Defaults to 8GB; must be at least 512M (Ref.: ElasticSearch documentation.
This was fixed here: https://docs.openshift.com/container-platform/3.7/install_config/aggregate_logging.html#aggregate-logging-ansible-variables. Closing this bug.