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7810dc6146
Adds `value_count` as one of the accepted metrics. The caveat is that it only accepts numeric values for two reasons: - Job validation at creation makes sure all metrics are numeric fields. Changing this would require new syntax (or disallowing anything but value_count on mixed fields) - when `toBuilders()` is called, we have to supply a ValueSource to the ValueCountBuilder, and we don't know what the field type is at that time. These are both fixable, but relatively more involved. I think numeric-only is a reasonable limitation to start with Original commit: elastic/x-pack-elasticsearch@270f24c8bf