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This commit slightly reworks the recommendations in the docs about setting the heap size: * the "rules of thumb" are actually instructions that should be followed * the reason for setting `Xmx` to 50% of the heap size is more subtle than just leaving space for the filesystem cache * it is normal to see Elasticsearch using more memory than `Xmx` * replace `cutoff` and `limit` with `threshold` since all three terms are used interchangeably * since we recommend setting `Xmx` equal to `Xms`, avoid talking about setting `Xmx` in isolation Relates #41954