IndexField indexField = indexLookup().get(field);
for (int i = 0; i < terms.length; i++) {
IndexFieldTerm indexFieldTerm = indexField.get(terms[i]);
try {
if (indexFieldTerm.tf() != 0) {
score += indexFieldTerm.tf() * indexField.docCount() / indexFieldTerm.df();
}
} catch (IOException e) {
throw new RuntimeException();
}
}