JVM options file vs. ES_JAVA_OPTS on ECK for setting heap size

Elastic Orchestration Elastic Cloud on Kubernetes (ECK)
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ECK documentation says to configure heap size using ES_JAVA_OPTS environment variable. But Elasticsearch docs say to not use ES_JAVA_OPTS in production and instead use an options file.

Is this a gap in ECK documentation?

Also, I am running ES 7.5, and documentation that far back doesn't mention configured heap size. Does that impact which solution I should use?

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