When working in a Q-Gorenstein ring, and computing the test ideal or whether a pair is F-regular, we find an N such that N * KR is Cartier. This option controls the maximum value of N to consider. The default value is 100. If you pass it a ring such that the smallest such N is less that MaxCartierIndex, then the function will throw an error. This value is ignored if the user specifies the option QGorensteinIndex.