toMerge
The default implementation calls #addNumericField, passing an Iterable that merges and filters deleted documents on the fly.
public virtual void MergeNumericField(FieldInfo fieldInfo, MergeState mergeState, IList<NumericDocValues> toMerge/*, IList<Bits> docsWithField*/) { AddNumericField(fieldInfo, GetMergeNumericFieldEnumerable(fieldInfo, mergeState, toMerge)); }