Warmers vs eager field data loading

I noticed the warmers documentation mentioned that it's often used for
fields involved in sorting/faceting. My understanding is this is because
those operations require the entire field loaded in the field data cache.
In this case why not set the fielddata.loading property to "eager" in the
field mapping? Wouldn't this accomplish the same thing? Also in what
situation does eager_global_ordinals loading option provide benefits?


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