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Sort: Support "missing" specific handling, include _last, _first, and custom value (for string values) #896
This is a follow up to #772 that supports special sorting for 'null' values for numeric fields. The same would be very useful for (not analyzed) string fields as well. If feasible, special handling for empty and blank strings would be useful. The latter is however optional as it is possible to achieve uniform handling by filtering out blank values at indexing time.