[8.0] Better error message for long keys in flattened fields (#80433) #80486
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When a keyed ´flattened` field that is composed of both the fields key, a separator and the actual value, exceeds Lucenes term limit, the user currently gets a confusing IAE that among other things only mentions the fields `_keyed` subfield as the source of the offending long term. Since it might be both key and value that might trip this we can check earlier and throw a nices IAE that reports both key and value lengths and the prefix of the offending key. Closes elastic#78248
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Backports the following commits to 8.0: