public int getStartI() {
        return i+skipI;
    }
Returns the position startI we should start at from this start point i.
startI==i except when there are i's from this starting point which are not found anywhere in
the field. In that case, startI==i+the number of terms following i which are known not to be present
searchlib/src/main/java/com/yahoo/searchlib/ranking/features/fieldmatch/SegmentStartPoint.java