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32e23b9100
Most aggregations (terms, histogram, stats, percentiles, geohash-grid) now support a new `missing` option which defines the value to consider when a field does not have a value. This can be handy if you eg. want a terms aggregation to handle the same way documents that have "N/A" or no value for a `tag` field. This works in a very similar way to the `missing` option on the `sort` element. One known issue is that this option sometimes cannot make the right decision in the unmapped case: it needs to replace all values with the `missing` value but might not know what kind of values source should be produced (numerics, strings, geo points?). For this reason, we might want to add an `unmapped_type` option in the future like we did for sorting. Related to #5324