toMerge
The default implementation calls {@link #addSortedNumericField}, passing iterables that filter deleted documents.
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if (values == null) { values = DocValues.emptySortedNumeric(); } toMerge.add(values); } consumer.mergeSortedNumericField(field, mergeState, toMerge); } else { throw new AssertionError("type=" + type); } } }